Lg Checkpoint Codes

LG

LG Checkpoint-codes Versie 2.4P-M

vervangt U02.3.M

• BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THE SERVICEMANUAL. • ONLY FOR AUTHORIZED SERVICE PERSONNEL.

1

Hoofdstukindeling Single A (vloer- & plafond UV / cassette UT / kanaal UB)........................................04 - Aan / Uit - Inverter UU..(W) - Variabel (aan/uit)..........................................................................................................26 AT-C.. / AT-H.. / LB-C.. / LB-D.. / LB-G.. / LB-H.. / LT-B.. / LT-C.. / LT-D.. / LT-E.. / LV-B.. / P..AH Multi-split ......................................................................................................................39 - Inverter FM..AH - Variabel (aan/uit)..........................................................................................................92 M..AC/AH

2

- Multi-split tot 2005.......................................................................................................94 A2-C.. / A3-C.. / A2-H.. / A3-H.. / LM.. RAC...............................................................................................................................96 - Standaard wandunit (aan/uit)......................................................................................97 LS-J.. / LS-K.. / LS-L.. / S..ACL / S..ACP / S..AH(P) / G..AH - ART COOL Deluxe / Panel (aan/uit)............................................................................97 LS-P.. / A09AH* / -12- / -18- / C07AH* / -09- / -12- Standaard wandunit Inverter........................................................................................99 LS-N.. / LS-Q.. / LS-R.. / S..AN / S..AW - ART COOL Deluxe Inverter.........................................................................................101 C09AW* / C12AW* - ART COOL Deluxe Inverter.........................................................................................103 C18AW* / C24AW* -ART COOL Panel Inverter............................................................................................105 A09AW* / A12AW* / A09AW1 / A12AW1

3

LG

Single A (vloer- & plafond UV / cassette UT / UB kanaal) UU..(W)

Inverter 1-fase (single-split) Inverter 3-fase (Single-split) Synchro (master/slave) Variabel (aan/uit, single-split)

4

Single A: Inverter & Synchro (UU..W & UU72 / 100)

5. Trouble Shooting

6.6 Check code Trouble shooting CH01, CH02, CH06 Display code

Title

Cause of error

Check point & Normal condition

01

Indoor air sensor

• Connector connection error • Faulty PCB • Faulty sensor (Open / Short)

Normal resistor : 10KΩ/ at 25˚C (Unplugged) Normal voltage : 2.5Vdc / at 25˚C(Plugged) Refer to sensor resistance table.

02

Indoor inlet pipe sensor

• Connector connection error • Faulty PCB • Faulty sensor (Open / Short)

Normal resistor : 5KΩ/ at 25˚C(Unplugged) Normal voltage : 2.5Vdc / at 25˚C(Plugged) Refer to sensor resistance table.

06

Indoor outlet pipe sensor

• Connector connection error Normal resistor : 5KΩ/ at 25˚C(Unplugged) • Faulty PCB Normal voltage : 2.5Vdc / at 25˚C(Plugged) • Faulty sensor (Open / Short) Refer to sensor resistance table.

Check Flow Chart

Unplug the sensor on Indoor unit PCB

Estimate the Voltage of each sensor.

Check the Connector connection

Is the voltage of the sensor 2.5Vdc at 25˚C

No Correct connection

Yes Is it normal ?

No Correct connection

Repair or Change the PCB.

Unplugged

Yes

Plugged

Estimate the resistance of each sensor. Is the resistance of the sensor 10Ω / 5kΩ at 25˚C? Yes

No Correct connection

10kΩ

2.5Vdc

Ω

V

Plug the sensor on Indoor unit PCB

Check the resistance

Check the voltage

LGE Internal Use Only

5

Single A: Inverter & Synchro (UU..W & UU72 / 100)

5. Trouble Shooting

6.7 Check code Trouble shooting CH03 Display code

03

Title

Cause of error

Check point & Normal condition

Communication Error (Wired remote controller)

• Connector connection error • Faulty PCB / Remote controller • Connection wire break

• Connection of wire • Main PCB Volt. DC12V • Noise interference

Check Flow Chart CN-REMO Check the wire connection(Open / Short / Miswirring) Is it normal ? Yes Is the soldering state of connector is normal? Yes

No Correct connection Or change connection wire

No Re-soldering component Or change the PCB

Check the volt. of main PCB power source. (DC 12V,DC 5V) Is it normal ? Yes

Wired R/C

Indoor Unit

S 12V GND (YL) (RD) (BR)

12V S GND (RD) (YL) (BR)

No Correct connection Or change the PCB

12Vdc

12Vdc

V

V

Check the installation of wired remote controller. (Noise interference) Is it normal ?

No Adjust the state of installation

Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes

Check the Volt.

- 68 -

Check the Volt.

LGE Internal Use Only

6

Single A: Inverter & Synchro (UU..W & UU72 / 100)

5. Trouble Shooting

6.8 Check code Trouble shooting CH04 Display code

Title

04

Drain pump / Float switch

Cause of error • Float switch open. (Normal : short) • Water over flow

Check point & Normal condition • The connection of wire (Drain pump/ Float switch) • Drain pump power input. (220V) • Drain tube installation. • Indoor unit installation. (Inclination)

Check Flow Chart

Check the level of water (Float moves top position) Is it normal ?

CN-Float

No Check Drain Pump

CN-Float

Yes Is the float switch clean ?

No Clean float switch

❊ Drain pump check

Yes

Check the wire connection (Open, Soldered poorly)

Check the wire connection (Open, Soldered poorly)

Is it normal ? Is it normal ? Yes Is the resistance of f loat switch normal (short) ?

No Correct connection Or re-soldering PCB

Yes

No Change the float switch

Is the resistance of Drain Pump? Normal ( about 400Ω ) ?

No Correct connection Or re-soldering PCB

No Change the Drain Pump

Yes Is the drain pump clean ?

No Clean drain pump

Yes Check drain tube installation

Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes

- 69 -

LGE Internal Use Only

7

5. Trouble Shooting

Single A: Inverter & Synchro (UU..W & UU72 / 100)

6.9 Check code Trouble shooting CH09, CH10 Display code

Title

09

EEPROM Check sum (Indoor)

10

BLDC motor fan lock (Indoor)

Cause of error

Check point & Normal condition

• Check sum error

• Check the poor soldering. • Change PCB

• Fan motor break down • Fan motor & PCB poor contact • Obstruction to the fan

• Check the indoor fan motor. • Check the connection status between • PCB and fan motor.

Check Flow Chart

Check the indoor fan motor. (Fan is locked by obstruction) Is it normal ?

No Remove obstruction

Yes Check the connection status between PCB and fan motor Is it normal ?

No Correct connection Or re-soldering PCB

Yes Check the DC Motor signal

Is it normal ?

No Change Indoor Motor

Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes

- 70 -

LGE Internal Use Only

8

Single A: Inverter & Synchro (UU..W & UU72 / 100)

5. Trouble Shooting

6.10 Check code Trouble shooting CH05, CH53 Display code

05 / 53

Title

Communication (Indoor↔Outdoor)

Cause of error

Check point & Normal condition

• The connector for transmission is disconnected. • The connecting wires are misconnected. • The communication line is break • Outdoor PCB is abnormal. • Indoor PCB is abnormal.

• Check power input AC 230V. (Outdoor, Indoor) • Check connector for transmission • Check wires are misconnecting. • Check transmission circuit of outdoor PCB • Check transmission circuit of indoor PCB

Check Flow Chart

Check the input power AC230V (Outdoor, Indoor unit) Is it normal ? ( 230V ±10% )

Is the connection of GND,GND1,GND2, correctly connected?

No Correct connection

Yes No Needs electric work

Change PCB

Yes Check the communication wires are correctly connected. Is it normal ? Yes Check the resistance between communication line and GND. (Normal : Over 2MΩ) Is it normal ?

No Adjust the connection of wire Confirm the wire of "Live", "Neutral", "Signal"

❊ CH05 is displayed at indoor unit, CH53 is displayed at outdoor unit.

No Correct connection

Yes Is connector for communication correctly connected?

Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes

- 71 -

LGE Internal Use Only

9

5. Trouble Shooting

Single A: Inverter & Synchro (UU..W & UU72 / 100)

6.11 Check code Trouble shooting CH21 Display code

21

Title

DC Peak

Cause of error

Check point & Normal condition

• Instant over current • Over Rated current • Poor insulation of IPM

• An instant over current in the U,V,W phase - Comp lock - The abnormal connection of U,V,W • Over load condition - Overcharging of refrigerant - Pipe length. • Poor insulation of compressor

Check Flow Chart

Check the wire connection.(U,V,W)

Is it normal ? Yes

Is it normal ? (1 Ph : 230V ±10% 3 Ph : 400V ±10% ) Yes

No Correct connection

Check DC link capacitor Is it normal? (Refer to belows)

Check the resistance of comp. (No difference at each terminal) Is it normal ? Yes

Yes Check Over load condition - Overcharging of refrigerant - Pipe Length - Condenser is blocked - Outdoor fan is locked

No Change Compressor

Check the electricity leakageof the compressor. (Refer to comp check table) Is it normal ? Yes

No Needs electric work

No Change DC link capacitor Or Main PCB Remove obstruction Change outdoor fan or motor Change refrigerant

No Change Main PCB No Change Compressor

❊ Dc link voltage table Model 1 Phase

Check the input power (Outdoor, Indoor unit)

3 Phase

Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes

DC Link Voltage Type

Operating DC280V ± 10% DC280V ± 10% DC380V ± 10% DC380V ± 10% DC380V ± 10% DC380V ± 10% DC380V ± 10%

PFC

DC300V ± 10%

DC380V ± 10%

PSC PFC PFC

DC540V ± 10% DC540V ± 10% DC540V ± 10%

DC500V ± 10% DC680V ± 10% DC680V ± 10%

PFC

DC540V ± 10%

DC680V ± 10%

PSC PSC PFC PFC PFC PFC PFC

AUUW606D AUUW368D AUUW428D AUUW488D AUUW608D

- 72 -

Non operating DC300V ± 10% DC300V ± 10% DC300V ± 10% DC300V ± 10% DC300V ± 10% DC300V ± 10% DC300V ± 10%

AUUW126C AUUW186C AUUW246D AUUW306D AUUW366D AUUW426D AUUW486D

LGE Internal Use Only

10

Single A: Inverter & Synchro (UU..W & UU72 / 100)

5. Trouble Shooting

6.12 Check code Trouble shooting CH22 Display code

Title

22

Max. C/T

Cause of error

Check point & Normal condition

• Malfunction of compressor • Blocking of pipe • Low voltage input • Refrigerant, pipe length, blocked, …

• Over current

Check Flow Chart

Check the wire connection.(U,V,W)

Is it normal ? Yes

Is it normal ? (1 Ph : 230V ±10% 3 Ph : 400V ±10% ) Yes

No Correct connection

Check DC link capacitor Is it normal? (Refer to belows)

Check the resistance of comp. (No difference at each terminal) Is it normal ? Yes

Yes Check Over load condition - Overcharging of refrigerant - Pipe Length - Condenser is blocked - Outdoor fan is locked

No Change Compressor

Check the electricity leakageof the compressor. (Refer to comp check table) Is it normal ? Yes

No Needs electric work

No Change DC link capacitor Or Main PCB Remove obstruction Change outdoor fan or motor Change refrigerant

No Change Main PCB No Change Compressor

❊ Dc link voltage table Model 1 Phase

Check the input power (Outdoor, Indoor unit)

3 Phase

Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes

DC Link Voltage Type

Operating

DC300V ± 10% DC300V ± 10% DC300V ± 10% DC300V ± 10% DC300V ± 10% DC300V ± 10% DC300V ± 10%

DC280V ± 10% DC280V ± 10% DC380V ± 10% DC380V ± 10% DC380V ± 10% DC380V ± 10% DC380V ± 10%

PFC

DC300V ± 10%

DC380V ± 10%

PSC PFC PFC

DC540V ± 10% DC540V ± 10% DC540V ± 10%

DC500V ± 10% DC680V ± 10% DC680V ± 10%

PFC

DC540V ± 10%

DC680V ± 10%

AUUW126C AUUW186C AUUW246D AUUW306D AUUW366D AUUW426D AUUW486D

PSC PSC PFC PFC PFC PFC PFC

AUUW606D AUUW368D AUUW428D AUUW488D AUUW608D

- 73 -

Non operating

LGE Internal Use Only

11

Single A: Inverter & Synchro (UU..W & UU72 / 100)

5. Trouble Shooting

6.13 Check code Trouble shooting CH40 Title

40

C/T Internal circuit

Cause of error

• Initial current error

Check point & Normal condition

• Malfunction of current detection circuit. (Open / Short) • The voltage of “C01N” Is 4.0Vdc (25A) .

→

Display code

Check Flow Chart

Check the input power AC230V (Outdoor, Indoor unit) TRANS Is it normal ? ( 230V±10%)

No Correct connection

Yes

→

Check “C01N” Is it normal (4.0Vdc )?

C01N No Change Main PCB

Yes Check Check TRANS Is it normal?

No Change TRANS

Yes Change main PCB

V

Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes

- 74 -

LGE Internal Use Only

12

Single A: Inverter & Synchro (UU..W & UU72 / 100)

5. Trouble Shooting

6.14 Check code Trouble shooting CH23, CH28 Display code

Title

23

DC Link Low voltage.

• 1ph : DC link volt. is 140Vdc . • 3ph : DC link volt. is 250Vdc .

• Check the power source. • Check the components.

28

DC Link High voltage

• 1ph : DC link volt. is 140Vdc . • 3ph : DC link volt. is 250Vdc .

• Check the power source. • Check the components.

25

Input voltage

• Abnormal Input voltage (140Vac , 300Vac )

• Check the power source. • Check the components.

Cause of error

Check point & Normal condition

→

→

→

→

→

❊ Check DC link voltage

Check Flow Chart

Check the wire connection.(U,V,W)

Is it normal ? Yes Is it normal ? Yes

V

No Correct connection

❊ Check TRANS1

No Change Compressor

CN_TRANS 1

❊ Dc link voltage table Is it normal ? Yes

No Change Compressor

Model 1 Phase

Check the input power

3 Phase

Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes

DC Link Voltage Type

Operating

DC300V ± 10% DC300V ± 10% DC300V ± 10% DC300V ± 10% DC300V ± 10% DC300V ± 10% DC300V ± 10%

DC280V ± 10% DC280V ± 10% DC380V ± 10% DC380V ± 10% DC380V ± 10% DC380V ± 10% DC380V ± 10%

PFC

DC300V ± 10%

DC380V ± 10%

PSC PFC PFC

DC540V ± 10% DC540V ± 10% DC540V ± 10%

DC500V ± 10% DC680V ± 10% DC680V ± 10%

PFC

DC540V ± 10%

DC680V ± 10%

AUUW126C AUUW186C AUUW246D AUUW306D AUUW366D AUUW426D AUUW486D

PSC PSC PFC PFC PFC PFC PFC

AUUW606D AUUW368D AUUW428D AUUW488D AUUW608D

- 75 -

Non operating

LGE Internal Use Only

13

5. Trouble Shooting

Single A: Inverter & Synchro (UU..W & UU72 / 100)

6.15 Check code Trouble shooting CH24 Display code

Title

24

Press S/W Open

Cause of error

Check point & Normal condition

• Check the connection of “CN_PRESS” • Check the SVC V/V open. • Check the leakage of refrigerant.

• Low / High press S/W open.

Check Flow Chart

Is the wire connection normal ?

❊ Pressure switch table No Correct connection

Switch Spec Model

Yes Is the soldering state of connector is normal?

No Re-soldering component

Yes Is the SVC Valve opened ?

Low pressure switch 0.03 Mpa AUUW126C AUUW186C

High pressure switch 4.3 Mpa AUUW246D AUUW306D AUUW366D AUUW426D AUUW486D AUUW606D AUUW368D AUUW428D AUUW488D AUUW608D

No Open SVC Valve

Yes CN_PRESS

Check the leakage of refrigerant. Check Pressure of suction pipe Check Pressure of discharge pipe Is it normal ?

Yes

No Re-vaccuming system & Re-charging

Change main PCB

Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes

- 76 -

LGE Internal Use Only

14

Single A: Inverter & Synchro (UU..W & UU72 / 100)

5. Trouble Shooting

6.16 Check code Trouble shooting CH26, CH27 Display code

Title

26

DC Compressor Position

• Compressor position detect error

• Check the connection of comp wire “U,V,W” • Malfunction of compressor • Check the component of “IPM”, detection parts.

27

PSC Fault PFC Fault

• Over current at “IGBT”/PFC module

• Check the component of “IGBT” /PFC module. • Check the components.

Cause of error

Check point & Normal condition

Check Flow Chart

Check the wire connection.(U,V,W)

Is it normal ? Yes

Is it normal ? (1 Ph : 230V ±10% 3 Ph : 400V ±10% ) Yes

No Correct connection

Check DC link capacitor Is it normal? (Refer to belows)

Check the resistance of comp. (No difference at each terminal) Is it normal ? Yes

Yes Check Over load condition - Overcharging of refrigerant - Pipe Length - Condenser is blocked - Outdoor fan is locked

No Change Compressor

Check the electricity leakageof the compressor. (Refer to comp check table) Is it normal ? Yes

No Needs electric work

No Change DC link capacitor Or Main PCB Remove obstruction Change outdoor fan or motor Change refrigerant

No Change Main PCB No Change Compressor

❊ Dc link voltage table Model 1 Phase

Check the input power (Outdoor, Indoor unit)

3 Phase

Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes

DC Link Voltage Type

Operating

DC300V ± 10% DC300V ± 10% DC300V ± 10% DC300V ± 10% DC300V ± 10% DC300V ± 10% DC300V ± 10%

DC280V ± 10% DC280V ± 10% DC380V ± 10% DC380V ± 10% DC380V ± 10% DC380V ± 10% DC380V ± 10%

PFC

DC300V ± 10%

DC380V ± 10%

PSC PFC PFC

DC540V ± 10% DC540V ± 10% DC540V ± 10%

DC500V ± 10% DC680V ± 10% DC680V ± 10%

PFC

DC540V ± 10%

DC680V ± 10%

AUUW126C AUUW186C AUUW246D AUUW306D AUUW366D AUUW426D AUUW486D

PSC PSC PFC PFC PFC PFC PFC

AUUW606D AUUW368D AUUW428D AUUW488D AUUW608D

- 77 -

Non operating

LGE Internal Use Only

15

4. Trouble Shooting Display code

29

Single A: Inverter & Synchro (UU..W & UU72 / 100)

Title

Inverter compressor over current

Cause of error

Check point & Normal condition

1. Overload operation (Pipe clogging/Covering/EEV defect/Ref. overcharge) Inverter compressor input 2. Compressor damage(Insulation damage/Motor current is over 30A damage) 3. Input voltage low 4. ODU inverter PCB assembly damage

■ Error Diagnosis and Countermeasure Flow Chart Is installation condition normal?

No

Yes Are the resistance Between each phase and insulation resistance of Inverter compressor normal?

No

1. Check Pipe clogging/distortion 2. Check Covering (Indoor/Outdoor Unit) 3. Check EEV connector assemble condition/normal operation 4. Check refrigerant pressure → Reassemble or manage if abnormality found 1. Check resistance between each terminal of compressor (0.188 ±7%) 2. Check insulation resistance between compressor terminal and pipe (over 50MΩ ) → Replace compressor if abnormality found

Yes Is compressor Wire connection condition normal?

No

1. Check inverter PCB assembly U,V,W connector connection condition 2. Check wire disconnection and wiring 3. Check compressor terminal connection condition (bad contact) → Reassemble if abnormality found

Yes

Is input voltage normal?

No

Check L~N phase is 220V ±15% → Check connection condition and wiring if power is abnormal

No

Check inverter PCB assembly IPM normality → Replace inverter PCB assembly

Yes

Is inverter PCB assembly normal?

Yes Recheck power and installation condition

Copyright ©2007 LG Electronics. Inc. All right reserved. Only for training and service purposes

- 90 -

LGE Internal Use Only

16

Single A: Inverter & Synchro (UU..W & UU72 / 100)

5. Trouble Shooting

6.17 Check code Trouble shooting CH32, CH33 Title

32

D-pipe (Inverter) temp. high (105˚C )

33

D-pipe (Constant) temp. high (105˚C ) →

→

Display code

Cause of error

Check point & Normal condition

• Discharge sensor (Inverter) temp. high

• Check the discharge pipe sensor for INV. • Check the install condition for over load. • Check the leakage of refrigerant. • Check the SVC V/V open. • Refer to sensor resistance table.

• Discharge sensor (Cons.) temp. high

• Check the discharge pipe sensor for Cons. • Check the install condition for over load. • Check the leakage of refrigerant. • Check the SVC V/V open. • Refer to sensor resistance table.

Check Flow Chart

Check Over load condition - Refrigerant leakage - Condenser is blocked - Outdoor fan is locked Yes

Is the resistance of the sensor is 200kΩ at 25˚C?

No Remove obstruction Change outdoor fan or motor Change refrigerant

Yes Plug the sensor on Indoor unit PCB

Unplug the sensor on Outdoor unit PCB

Estimate the Voltage of each sensor.

Check the Connector connection

Is it normal ?

No Change the sensor

Yes Is the voltage of the sensor is 4.5Vdc at 25˚C

No Correct connection

Yes

Yes Repair or Change the PCB.

Estimate the resistance of each sensor.

Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes

No Change the sensor

- 78 -

LGE Internal Use Only

17

Single A: Inverter & Synchro (UU..W & UU72 / 100) Display code

Title

39

Transmission Error Between (PFC Micom → INV Micom)

Cause of error

4. Trouble Shooting

Check point & Normal condition 1. Micom defect/Circuit defect 2. Different Micom S/W Version 3. ODU inverter PCB assembly damage

Communication Error Between PFC Micom and INV Micom.

■ Error Diagnosis and Countermeasure Flow Chart

Is PFC Micom & INV Micom S/W Program normal?

No

Upgrade Micom Program

Yes

Is Inverter PCB assembly normal?

No

Replace inverter PCB assembly

Yes

Recheck power and installation condition

Copyright ©2007 LG Electronics. Inc. All right reserved. Only for training and service purposes

- 115 -

LGE Internal Use Only

18

Single A: Inverter & Synchro (UU..W & UU72 / 100)

5. Trouble Shooting

6.18 Check code Trouble shooting CH41, CH44, CH45, CH46, CH47, CH65 Display code

Title

41 47

D-pipe sensor(Inv) D-pipe sensor(Cons)

• Connector connection error • Normal resistor : 200KΩ/ at 25˚C (Unplugged) • Normal voltage : 4.5Vdc / at 25˚C (plugged) • Faulty PCB • Faulty sensor (Open / Short) • Refer to sensor resistance table.

44

Air sensor

• Connector connection error • Normal resistor : 10KΩ/ at 25˚C (Unplugged) • Normal voltage : 2.5Vdc / at 25˚C (plugged) • Faulty PCB • Faulty sensor (Open / Short) • Refer to sensor resistance table.

45 46

Condenser Pipe sensor Suction Pipe sensor

• Connector connection error • Normal resistor : 5KΩ/ at 25˚C (Unplugged) • Normal voltage : 2.5Vdc / at 25˚C (plugged) • Faulty PCB • Faulty sensor (Open / Short) • Refer to sensor resistance table.

65

Heat sink sensor

• Connector connection error • Normal resistor : 5KΩ/ at 25˚C (Unplugged) • Normal voltage : 2.5Vdc / at 25˚C (plugged) • Faulty PCB • Faulty sensor (Open / Short) • Refer to sensor resistance table.

Cause of error

Check point & Normal condition

Check Flow Chart

Unplug the sensor on Indoor unit PCB

Estimate the Voltage of each sensor.

Check the Connector connection

Is the voltage of the sensor is 4.5Vdc / 2.5Vdc at 25˚C

No Change the sensor

Yes Is it normal ?

No Correct connection

Yes

Repair or Change the PCB.

Unplugged

Plugged

Estimate the resistance of each sensor. Is the resistance of the Sensor is 200kΩ/10kΩ⁄ /5kΩ at 25˚C?

No Change the sensor

Yes

10kΩ

2.5Vdc

Ω

V

Plug the sensor on Indoor unit PCB

Check the resistance

Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes

- 79 -

Check the voltage

LGE Internal Use Only

19

Single A: Inverter & Synchro (UU..W & UU72 / 100)

5. Trouble Shooting

6.19 Check code Trouble shooting CH51, CH60 Display code

Title

51

Over capacity

60

EEPROM Check sum

Cause of error

Check point & Normal condition

• Over capacity Combination

• Check the indoor unit capacity. • Check the combination table.

• Check sum error

• Check the connection port. • Check the poor soldering.

Check Flow Chart (CH51)

Check the indoor unit combination Check the outdoor unit max combination

Is it normal ?

No Correct connection

Yes Check PCB

Check Flow Chart (CH60) Check the the connection port.

Is it normal ?

No Correct connection

Yes Change EEPROM

Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes

- 80 -

LGE Internal Use Only

20

Single A: Inverter & Synchro (UU..W & UU72 / 100) Display code

Title

Cause of error

52

Transmission error between (Inverter PCB ➔ Main PCB)

Main controller of Master unit of Master unit can’t receive signal from inverter controller

4. Trouble Shooting

Check point & Normal condition 1. Power cable or transmission cable is not connected 2. Defect of outdoor Main fuse/Noise Filter 3. Defect of outdoor Main / inverter PCB

■ Error diagnosis and countermeasure flow chart Is transmission LED (Yellow) of inverter compressor PCB on?

No

Is noise filter or fuse normal?

No

Replace noise filter or fuse

Yes

Yes

Replace inverter compressor PCB

Is transmission cable connected correctly?

No Re-connect transmission cable

Yes

No Is MAIN PCB normal?

Replace MAIN PCB

Yes

Replace inverter compressor PCB

Check Point - Check the Transmission connector and LED (Main & Inverter)

48/56k



Copyright ©2007 LG Electronics. Inc. All right reserved. Only for training and service purposes



- 93 -

LGE Internal Use Only

21

Single A: Inverter & Synchro (UU..W & UU72 / 100)

Troubleshooting Guide

14) Troubleshooting CH54 Display code

Title

54

3-phase wrong wiring of main outdoor unit

Cause of error

• 3-phase wrong wiring of outdoor unit (Reverse Phase /omission of phase)

Check point & Normal condition

• Abnormal Main PCB • No connection of CN_Phase • Changed R, S, T connection order

Check Point 1. Check the connection condition of R,S,T wire. 2. Check the connection condition of CN_Phase. 3. Check the outdoor main fuse.

22

Single A: Inverter & Synchro (UU..W & UU72 / 100)

5. Trouble Shooting

6.20 Check code Trouble shooting CH61, CH62 Display code

Title

61

Condenser pipe sensor temp. high

• condenser pipe sensordetected high temp.(65˚C)

• Check the load condition. • Check the sensor of Condenser pipe sensor. • Normal resistor : 5KΩ/ at 25˚C (Unplugged) • Normal voltage : 2.5Vdc / at 25˚C (Plugged)

62

Heat sink sensor temp. high

• heat sink sensor detected high temp. (85˚C)

• Check the load condition. • Check the sensor of heat sink. • Normal resistor : 10KΩ/ at 25˚C (Unplugged) • Normal voltage : 2.5Vdc / at 25˚C (Plugged)

Cause of error

Check point & Normal condition

Check Flow Chart

Check Over load condition - Refrigerant leakage - Condenser is blocked - Outdoor fan is locked Yes

Is the resistance of the Sensor is 5kΩ /10kΩ at 25˚C?

No Remove obstruction Change outdoor fan or motor Change refrigerant

Yes Plug the sensor on Indoor unit PCB

Unplug the sensor on Outdoor unit PCB

Estimate the Voltage of each sensor.

Check the Connector connection

Is it normal ?

No Change the sensor

Yes Is the voltage of the sensor is 4.5Vdc / 2.5Vdc at 25˚C

No Correct connection

Yes

Yes Repair or Change the PCB.

Estimate the resistance of each sensor.

Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes

No Change the sensor

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LGE Internal Use Only

23

Single A: Inverter & Synchro (UU..W & UU72 / 100)

4. Trouble Shooting Display code

73

Title

AC input instant over current error (Matter of software)

Cause of error

Check point & Normal condition

Inverter PCB input power current is over 48A(peak) for 2ms

1. Overload operation (Pipe clogging/Covering/EEV defect/Ref.overcharge) 2. Compressor damage (Insulation damage/Motor damage) 3. Input voltage abnormal (L, N) 4. Power line assemble condition abnormal 5. Inverter PCB assembly damage (input current sensing part)

■ Error Diagnosis and Countermeasure Flow Chart Is installation condition normal?

No

Yes

1.Check Pipe clogging/distortion 2.Check Covering (Indoor/Outdoor Unit) 3.Check EEV connector assemble condition/normal operation 4.Check refrigerant pressure → Reassemble or manage if abnormality found

No

Check L~N phase voltage is 220V ± 10% → Check connection condition and wiring if power is abnormal

No

1.Check L,N connection condition 2.Check wire disconnection and wiring → Reassemble if abnormality found

No

1.Check inverter PCB assembly U,V,W connector connection condition 2.Check wire disconnection and wiring 3.Check compressor terminal connection condition(bad contact) → Reassemble if abnormality found

Is input voltage normal?

Yes

Is AC input Wire connection condition normal? Yes

Is compressor Wire connection condition normal? Yes

Is inverter PCB assembly normal?

No Check inverter PCB assembly IPM normality → Replace inverter PCB assembly

Yes Recheck power and installation condition

Copyright ©2007 LG Electronics. Inc. All right reserved. Only for training and service purposes

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LGE Internal Use Only

24

Single A: Inverter & Synchro (UU..W & UU72 / 100)

Troubleshooting Guide

16) Troubleshooting CH67, CH105 Display code

Title

Cause of error

67

Outdoor fan lock

• Outdoor fan is not operating

• Check the fan condition. • Check the fan connector

105

Communication error between main PCB and fan PCB

• Communication error between main PCB and fan PCB

• Short or fusing of communication line • Poor outdoor unit PCB • Power input when the DC link capacitor discharges

Check Point

Check point & Normal condition

• CH 67

• CH 105

1. Check the install condition for fan.

1. Is communication line between the main PCB and the fan PCB normal? 2. Is the communication LED on?

25

Single A Aan / uit, Single-split AT-C.. / AT-H.. LB-C.. / LB-D.. / LB-E.. / LB-G.. / LB-H.. LT-B.. / LT-C.. / LT-D.. / LT-E.. LV-B.. P03AH / P05AH / P08AH

26

Single A: Aan/uit Single-split (voor modellen, zie pag. 26)

Troubleshooting Guide

1) Troubleshooting CH01, CH02, CH06 Display code

Title

01

Indoor air sensor

• Open / Short • Soldered poorly • Internal circuit error

Normal resistor : 10K. / at 25°C (Unplugged) Normal voltage : 2.5Vdc / at 25°C (plugged)

02

Indoor inlet pipe sensor

• Open / Short • Soldered poorly • Internal circuit error

Normal resistor : 5K. / at 25°C (Unplugged) Normal voltage : 2.5Vdc / at 25°C (plugged)

Indoor outlet pipe sensor

• Open / Short • Soldered poorly • Internal circuit error

Normal resistor : 5K. / at 25°C (Unplugged) Normal voltage : 2.5Vdc / at 25°C (plugged)

06

Cause of error

Check point & Normal condition

10k.

2.5Vdc

.

V

Check the resistance

Check the voltage

Check Point

1. Unplug the sensor on Indoor unit PCB. 2. Estimate the resistance of each sensor. 3. If the resistance of the sensor is 10K. / 5K. at 25°C, then sensor is normal. 4. If the resistance of the sensor is 0 K. or 8 , then sensor is abnormal. → Change the sensor. 5. Plug the sensor on Indoor unit PCB and Power ON. 6. Estimate the voltage of each sensor. 7. If the voltage of the sensor is 2.5Vdc at 25°C, then sensor is normal. 8. If the resistance of the sensor is 0 or 5Vdc, then sensor is abnormal. → Repair or Change the PCB.

27

Single A: Aan/uit Single-split (voor modellen, zie pag. 26)

Troubleshooting Guide 2) Troubleshooting CH03 Display code

Title

03

Communication Wired R/C

Cause of error

Wired R/C 12V

S

• Open / Short • Wrong connection

Indoor Unit

GND

12V

S

• Connection of wire • Main PCB Volt. DC12V • Noise interference

CN-REMO

GND

12Vdc

12Vdc

V

V

Check the Volt.

Check point & Normal condition

Check the Volt.

Check Point

1. Check the wire connection. (Open / Short) → Repair the connection 2. Check the soldering state of connector. (Soldered poorly) → Repair or Change the PCB. 3. Check the volt. Of main PCB power source. (DC 12V, DC 5V) → Repair or Change the main PCB. 4. Check the installation of wired remote controller. (Noise interference) → Adjust the state of installation

28

Single A: Aan/uit Single-split (voor modellen, zie pag. 26)

Troubleshooting Guide

3) Troubleshooting CH04 Display code

Title

04

Drain pump / Float switch

Cause of error • Float switch Open. (Normal : short)

Check point & Normal condition • The connection of wire(Drain pump/ Float switch) • Drain pump power input. (220V) • Drain tube installation. • Indoor unit installation. (Inclination)

CN Float

CN-D/PUMP CN-Float

0. .

Check the resistance

Check Point

1. Check the wire connection. (Open, Soldered poorly) → Repair the connection or change the PCB. 2. Check the resistance of float switch (Abnormal : Open, Normal : short) → Check the float switch. 3. Check the level of water 4. Check the volt. Of Drain pump power supply. (AC 230V) → Repair or Change the main PCB.

29

Troubleshooting Guide

Single A: Aan/uit Single-split (voor modellen, zie pag. 26)

4) Troubleshooting CH05, CH53 Display code 05 / 53

Title

Communication (Indoor → Outdoor)

Cause of error

• Communication poorly

Check point & Normal condition • Power input AC 220V. (Outdoor, Indoor) • The connector for transmission is disconnected. • The connecting wires are misconnected. • The GND1,2 is not connected at main GND. • The communication line is shorted at GND. • Transmission circuit of outdoor PCB is abnormal. • Transmission circuit of indoor PCB is abnormal.

Check Point

1. Check the input power AC230V. (Outdoor, Indoor unit) 2. Check the communication wires are correctly connected. → Adjust the connection of wire → Confirm the wire of “Live”, “Neutral” 3. Check the resistance between communication line and GND. (Normal : Over 2M. ) 4. Check the connector for communication is correctly connected. 5. Check the connection of GND1, GND2, and main GND. 6. If one indoor unit is operated normally, outdoor PCB is no problem. → Check the another indoor unit. * CH05 is displayed at indoor unit, CH53 is displayed at outdoor unit.

30

Single A: Aan/uit Single-split (voor modellen, zie pag. 26)

Troubleshooting Guide

5) Troubleshooting CH21 Display code

Title

21

Cause of error

• Instant over current • Over Rated current • Poor insulation of IPM

DC Peak

Comp U

Terminal U-V V-W W-U

W

Comp

• An instant over current in the U,V,W phase - Comp lock - The abnormal connection of U,V,W • Over load condition - Overcharging of refrigerant - Pipe length. • Poor insulation of compressor

Resistance(. ) at 20°C .

V

Check point & Normal condition

Copper pipe

Inverter Constant comp. comp. 0.64 0.64 0.64

0.8 0.8 0.8

Resistance(. ) at 20°C .

Terminal U-GND V-GND W-GND

Inverter Constant comp. comp. 2M. 2M. 2M.

2M. 2M. 2M.

Check Point

1. Check the wire connection. (U,V,W) 2. Check the load condition. (Refrigerant, Pipe length, …) → Adjust the load condition 3. Check the electricity leakage of the compressor. → Normal : Over 2M. . 4. Check the resistance of compressor. → Normal : 0.65. (INV), 0.8. (Cons.) → No difference at each terminal. 5. Check the insulation from water at IPM part. → Check the trace of water. 6. Check the IPM circuit.

31

Single A: Aan/uit Single-split (voor modellen, zie pag. 26)

Troubleshooting Guide

6) Troubleshooting CH21, CH22 Display code

Title

Cause of error

21

Max. C/T

22

C/T Internal circuit

Check point & Normal condition

Over current (14A )

Malfunction of compressor Blocking of pipe Low voltage input Refrigerant, pipe length, blocked, …

Initial current error

Malfunction of current detection circuit. (Open / Short) The voltage of “C01N” Is 4.0Vdc(25A) .

V

-

Check Point 1. Check the power source.

+

-

2. Check the fan operation is right.

+

-

3. Check the current. 4. Check the install condition. 5. Check the internal circuit. (C/T, Diode, Resistor)

108 Universal System Air Conditioner

+

Troubleshooting Guide

Single A: Aan/uit Single-split (voor modellen, zie pag. 26)

8) Troubleshooting CH24, CH25 Display code

Title

24

Press S/W Open

25

Input voltage

Cause of error

Check point & Normal condition

• Low / High press S/W open.

• Check the connection of “CN_Press”. • Check the components.

• Abnormal Input voltage (140Vac , 300Vac .

• Check the power source. • Check the components.

TRANS1 50Hz, DC12V

CN PRESS

CN TRNAS1

Check Point • CH 24

• CH 25

1. Check the connection of “CN_PRESS”

1. Check the power source.

2. Check the install condition for over load.

2. Check the components (Trans1, B/Diode, Diode, Resistance)

3. Check the SVC V/V open. 4. Check the leakage of refrigerant.

110 Universal System Air Conditioner

Troubleshooting Guide

Single A: Aan/uit Single-split (voor modellen, zie pag. 26)

10) Troubleshooting CH32, CH33 Display code

Title

32

D-pipe (Inverter) temp. high (105°C )

33

D-pipe (Constant) temp. high (105°C )

Cause of error

Check point & Normal condition

• Discharge sensor (Inverter) temp. high

• Check the discharge pipe sensor for INV. • Check the install condition for over load. • Check the leakage of refrigerant. • Check the SVC V/V open.

• Discharge sensor (Cons.) temp. high

• Check the discharge pipe sensor for Cons. • Check the install condition for over load. • Check the leakage of refrigerant. • Check the SVC V/V open.

D-Pipe temp. Toff(105) °C T2(95) °C T1(90) °C

COMP Frequency Normal (Hz) LEV Openness (Pulse)

Normal

Normal

OFF

Normal

OFF Control

Check Point • CH 32

• CH 33

1. Check the install condition for over load.

1. Check the install condition for over load.

2. Check the SVC V/V open.

2. Check the SVC V/V open.

3. Check the leakage of refrigerant.

3. Check the leakage of refrigerant. 4. Check the constant compressor. (same with CH21)

34

Single A: Aan/uit Single-split (voor modellen, zie pag. 26)

Troubleshooting Guide

11) Troubleshooting CH41, CH44, CH45, CH46, CH47, CH65 Display code

Title

41

D-pipe sensor (Inverter)

• Open / Short • Soldered poorly • Internal circuit error

• Normal resistor : 200K. / at 25°C (Unplugged) • Normal voltage : 4.5Vdc / at 25°C (plugged)

44

Air sensor

• Open / Short • Soldered poorly • Internal circuit error

• Normal resistor : 10K. / at 25°C (Unplugged) • Normal voltage : 2.5Vdc / at 25°C (plugged)

45

Condenser Pipe sensor

• Open / Short • Soldered poorly • Internal circuit error

• Normal resistor : 5K. / at 25°C (Unplugged) • Normal voltage : 2.5Vdc / at 25°C (plugged)

46

Suction Pipe sensor

• Open / Short • Soldered poorly • Internal circuit error

• Normal resistor : 5K. / at 25°C (Unplugged) • Normal voltage : 2.5Vdc / at 25°C (plugged)

D-pipe sensor (Constant)

• Open / Short • Soldered poorly • Internal circuit error

• Normal resistor : 200K. / at 25°C (Unplugged) • Normal voltage : 4.5Vdc / at 25°C (plugged)

Heat sink sensor

• Open / Short • Soldered poorly • Internal circuit error

• Normal resistor : 10K. / at 25°C (Unplugged) • Normal voltage : 2.5Vdc / at 25°C (plugged)

47

65

Cause of error

Check point & Normal condition

Check Point

1. Estimate the resistance of each sensor.(Unplugged) 2. Estimate the voltage of each sensor.(Plugged) 3. If the resistance of the sensor is 0 k. or 8 , then sensor is abnormal.

.

If the voltage of the sensor is 0 V or 5Vdc, then sensor is abnormal.

35

Single A: Aan/uit Single-split (voor modellen, zie pag. 26)

Troubleshooting Guide

12) Troubleshooting CH51, CH60 Display code

Title

51

Over capacity

60

EEPROM Check sum

Cause of error

Check point & Normal condition

• Over capacity Combination

• Check the indoor unit capacity. • Check the combination table.

• Check sum error

• Check the PCB ASM P/No. • Check the poor soldering.

Model

Gross max. capacity

Max. single indoor unit capacity

AUUW126B

21k

12k

AUUW186B AUUW246B

24k

12K

AUUW306B AUUW366B

33k

18K

AUUW4860

39k

18K

AUUW6060

52k

24K

Check Point • CH 51

• CH 60

1. Check the indoor unit capacity.

1. Check the insertion condition of EEPROM. 2. Check the poor soldering

36

Single A: Aan/Uit Single-split (voor modellen, zie pag. 26)

Troubleshooting Guide

13) Troubleshooting CH61, CH62 Display code

Title

Cause of error

61

Condenser pipe sensor temp. high

• Condenser pipe sensor detected high temp.(65°C)

• Check the load condition. • Check the sensor of Condenser pipe sensor.

62

Heat sink sensor temp. high

• Heat sink sensor detected high temp.(85°C)

• Check the fan is locked. • Check the sensor of heat sink.

Check point & Normal condition

Heat Sink temp. Toff °C T2 °C T1 °C

COMP Frequency Normal (Hz)

Normal

Check Point

OFF

Normal

• CH 61

• CH 62

1. Check the install condition for over load. (Refrigerant, Pipe length, Blocked, …)

1. Check the fan is locked. 2. Check the Outdoor temp. is very high.

37

Single A: Aan/uit Single-split (voor modellen, zie pag. 26) Troubleshooting Guide

Troubleshooting CH54 Display code

Title

54

Phase error

Cause of error

Check point & Normal condition

• Check the Main power • Check the CN_PHASE connector

• Phase change

U

V

Phase_A

W

5.3 msec

Phase_B Phase_C 1 0 1

1 0 0

1 1 0

0 1 0

0 1 1

0 0 1

Check Point 1. Check the Main power. 2. Check the connecting state of connector CN_3PHASE on the outdoor pcb ass'y.

38

LG

Multi-split Inverter FM..AH

39

Multi-split: Inverter FM..AH

4. Trouble Shooting

6.6 Troubleshooting Indoor Error Display code

Title

01

Indoor air sensor

• Open / Short • Soldered poorly • Internal circuit error

Normal resistor : 10KΩ/ at 25°C (Unplugged) Normal voltage : 2.5Vdc / at 25°C (plugged)

02

Indoor inlet pipe sensor

• Open / Short • Soldered poorly • Internal circuit error

Normal resistor : 5KΩ/ at 25°C (Unplugged) Normal voltage : 2.5Vdc / at 25°C (plugged)

06

Indoor outlet pipe sensor

• Open / Short • Soldered poorly • Internal circuit error

Normal resistor : 5KΩ/ at 25°C (Unplugged) Normal voltage : 2.5Vdc / at 25°C (plugged)

Cause of error

Check point & Normal condition

10kΩ

2.5Vdc

Ω

V

Check the resistance

Check the voltage

Check Point 1. Unplug the sensor on Indoor unit PCB. 2. Estimate the resistance of each sensor. 3. If the resistance of the sensor is 10KΩ/ 5KΩ at 25°C, then sensor is normal. 4. If the resistance of the sensor is 0 KΩ or ∞, then sensor is abnormal. → Change the sensor. 5. Plug the sensor on Indoor unit PCB and Power ON. 6. Estimate the voltage of each sensor. 7. If the voltage of the sensor is 2.5Vdc at 25°C, then sensor is normal. 8. If the resistance of the sensor is 0 or 5Vdc, then sensor is abnormal. → Repair or Change the PCB.

Copyright ©2007 LG Electronics. Inc. All right reserved. Only for training and service purposes

- 59 -

LGE Internal Use Only

40

Multi-split: Inverter FM..AH

4. Trouble Shooting Display code

Title

03

Communication Wired R/C

Cause of error

Wired R/C 12V

S

• Open / Short • Wrong connection

Indoor Unit

GND

12V

S

• Connection of wire • Main PCB Volt. DC12V • Noise interference

CN-REMO

GND

12Vdc

12Vdc

V

V

Check the Volt.

Check point & Normal condition

Check the Volt.

Check Point 1. Check the wire connection. (Open / Short) → Repair the connection 2. Check the soldering state of connector. (Soldered poorly) → Repair or Change the PCB. 3. Check the volt. Of main PCB power source. (DC 12V, DC 5V) → Repair or Change the main PCB. 4. Check the installation of wired remote controller. (Noise interference) → Adjust the state of installation

Copyright ©2007 LG Electronics. Inc. All right reserved. Only for training and service purposes

- 60 -

LGE Internal Use Only

41

Multi-split: Inverter FM..AH Display code

Title

04

Drain pump / Float switch

Cause of error

• Float switch Open. (Normal : short)

4. Trouble Shooting Check point & Normal condition

• The connection of wire(Drain pump/ Float switch) • Drain pump power input. (220V) • Drain tube installation. • Indoor unit installation. (Inclination)

CN Float

CN-D/PUMP CN-Float

0Ω Ω

Check the resistance

Check Point 1. Check the wire connection. (Open, Soldered poorly) → Repair the connection or change the PCB. 2. Check the resistance of float switch (Abnormal : Open, Normal : short) → Check the float switch. 3. Check the level of water 4. Check the volt. Of Drain pump power supply. (AC 230V) → Repair or Change the main PCB.

Copyright ©2007 LG Electronics. Inc. All right reserved. Only for training and service purposes

- 61 -

LGE Internal Use Only

42

4. Trouble Shooting

Multi-split: Inverter FM..AH

6.7 Troubleshooting Outdoor Error ▶FM15AH t/m FM25AH

Display code

05 / 53

Title

Communication (Indoor → Outdoor)

Cause of error

• Communication poorly

Check point & Normal condition • Power input AC 220V. (Outdoor, Indoor) • The connector for transmission is disconnected. • The connecting wires are misconnected. • The GND1,2 is not connected at main GND. • The communication line is shorted at GND. • Transmission circuit of outdoor PCB is abnormal. • Transmission circuit of indoor PCB is abnormal.

Check Point 1. Check the input power AC230V. (Outdoor, Indoor unit) 2. Check the communication wires are correctly connected. → Adjust the connection of wire → Confirm the wire of “Live”, “Neutral” 3. Check the resistance between communication line and GND. (Normal : Over 2MΩ) 4. Check the connector for communication is correctly connected. 5. Check the connection of GND1, GND2, and main GND. 6. If one indoor unit is operated normally, outdoor PCB is no problem. → Check the another indoor unit. * CH05 is displayed at indoor unit, CH53 is displayed at outdoor unit.

Copyright ©2007 LG Electronics. Inc. All right reserved. Only for training and service purposes

- 62 -

LGE Internal Use Only

43

Multi-split: Inverter FM..AH

4. Trouble Shooting ▶FM27AH t/m FM57AH Display code

Title

05 / 53

Title Communication (Indoor → Outdoor)

Cause of error

• Communication poorly

Check point & Normal condition • Power input AC 220V. (Outdoor, Indoor) • The connector for transmission is disconnected. • The connecting wires are misconnected. • The communication line is shorted at GND. • Transmission circuit of outdoor PCB is abnormal. • Transmission circuit of indoor PCB is abnormal.

Check Point 1. Check the input power AC230V. (Outdoor, Indoor unit) 2. Check the communication wires are correctly connected. Adjust the connection of wire Confirm the wire of "Live", "Neutral" 3. Check the resistance between communication line and GND. (Normal : Over 2MΩ) 4. Check the connector for communication is correctly connected. 5. If one indoor unit is operated normally, outdoor PCB is no problem. Check the another indoor unit. * CH05 is displayed at indoor unit, CH53 is displayed at outdoor unit. 6. If all indoor unit is displayed CH05 but outdoor PCB not display CH53 : Check the CN_COM and CN_POWER is correctly connected.

L

N

< TERMINAL BLOCK >

• 27/30/40k 1. In Case of CH53, Check the Connection → L , N at the terminal block • 48/56k 1. In Case of CH05, Check the Connection → CN-POWER, CN-COMM at the Main PCB 2. In Case of CH53, Check the Connection → CN-COMM at the Main PCB → L , N at the terminal block

L

N

N L

N

CN-COMM

CN-Power < MAIN PCB >

Copyright ©2007 LG Electronics. Inc. All right reserved. Only for training and service purposes

- 72 -

LGE Internal Use Only

44

Multi-split: Inverter FM..AH

FM15AH t/m FM27AH 4. Trouble Shooting Display code

Title

Cause of error

• Instant over current • Over Rated current • Poor insulation of IPM

DC PEAK (IPM Fault)

21

Check point & Normal condition • An instant over current in the U,V,W phase - Comp lock - The abnormal connection of U,V,W • Over load condition - Overcharging of refrigerant Pipe length. Outdoor Fan is stop • Poor insulation of compressor

■ Error Diagnosis and Countermeasure Flow Chart 1. Check Pipe clogging/distortion 2. Check Covering (Indoor/Outdoor Unit) 3. Check EEV connector assemble condition/normal operation 4. Check refrigerant pressure Reassemble or manage if abnormality found

No

Is installation condition normal?

Yes Are the resistance Between each phase and insulation resistance of Inverter compressor normal?

1. Check resistance between each terminal of compressor (1.083~1.123Ω ±5%) 2. Check insulation resistance between compressor terminal and pipe (over 50M ) Replace compressor if abnormality found

No

Yes Is compressor Wire connection condition normal?

No

1. Check inverter PCB assembly U,V,W connector connection condition 2. Check wire disconnection and wiring 3. Check compressor terminal connection condition (bad contact) Reassemble if abnormality found

No

Check inverter PCB assembly IPM normality Replace inverter PCB assembly

Yes

Is inverter PCB assembly normal?

Yes Recheck power and installation condition

■ Comp checking method Comp U

Resistance(Ω) at 20°C Ω

V

W

Comp

Copper pipe

Terminal

Inverter comp.

U-V V-W W-U

1.083 1.123 1.096

Resistance(Ω) at 20°C Ω

Terminal

Inverter comp.

U-GND V-GND W-GND

50MΩ 50MΩ 50MΩ

Copyright ©2007 LG Electronics. Inc. All right reserved. Only for training and service purposes

LGE Internal Use Only

45

Multi-split: Inverter FM..AH

FM15AH t/m FM25AH

4. Trouble Shooting

1. Wait until inverter PCB DC voltage is discharged after main power off. 2. Pull out CN-L1(R), CN-L2(S), CN-L3(T) and CN-COMP Connector. 3. Set multi tester to resistance mode. 4. If the value between P and N terminal of IPM is short(0Ω) or open(hundreds MΩ), PCB needs to be replaced.(IPM damaged) 5. Set the multi tester to diode mode. 6. In case measured value is different from the table, PCB needs to be replaced.(PCB damaged). P

U

V

W

Nu Nv Nw

P

U

V

W

Nu Nv Nw

27

26

25

24

23 22 21

27

26

25

24

23 22 21

0.4 ~ 0.6 V

0.4 ~ 0.6 V

PFC_IPM check U, V, W ➔ R S T

CAUTION In case that the control box is opend and before checking electrical parts, it should be checked that the LED 01M, 02M turned off(wait 7 minutes after main power OFF), otherwise it may cause electrical shock.

Copyright ©2007 LG Electronics. Inc. All right reserved. Only for training and service purposes

LGE Internal Use Only

46

Multi-split: Inverter FM..AH

FM27AH t/m FM57AH Display code

Title

Cause of error

• Instant over current • Over Rated current • Poor insulation of IPM

DC PEAK (IPM Fault)

21

4. Trouble Shooting Check point & Normal condition

• An instant over current in the U,V,W phase - Comp lock - The abnormal connection of U,V,W • Over load condition - Overcharging of refrigerant Pipe length. Outdoor Fan is stop • Poor insulation of compressor

■ Error Diagnosis and Countermeasure Flow Chart 1. Check Pipe clogging/distortion 2. Check Covering (Indoor/Outdoor Unit) 3. Check EEV connector assemble condition/normal operation 4. Check refrigerant pressure Reassemble or manage if abnormality found

No

Is installation condition normal?

Yes Are the resistance Between each phase and insulation resistance of Inverter compressor normal?

1. Check resistance between each terminal of compressor (0.34~0.35 7%) 2. Check insulation resistance between compressor terminal and pipe (over 50M ) Replace compressor if abnormality found

No

Yes Is compressor Wire connection condition normal?

No

1. Check inverter PCB assembly U,V,W connector connection condition 2. Check wire disconnection and wiring 3. Check compressor terminal connection condition (bad contact) Reassemble if abnormality found

No

Check inverter PCB assembly IPM normality Replace inverter PCB assembly

Yes

Is inverter PCB assembly normal?

Yes Recheck power and installation condition

■ Comp checking method Comp U

Resistance(Ω) at 20°C Ω

V

U-V V-W W-U

W

Comp

Terminal

Copper pipe

Inverter Constant comp. comp. 0.64 0.64 0.64

0.8 0.8 0.8

Resistance(Ω) at 20°C Ω

Terminal U-GND V-GND W-GND

Inverter Constant comp. comp. 2MΩ 2MΩ 2MΩ

Copyright ©2007 LG Electronics. Inc. All right reserved. Only for training and service purposes

2MΩ 2MΩ 2MΩ

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LGE Internal Use Only

47

Multi-split: Inverter FM..AH

4. Trouble Shooting ■FM27AH t/m FM41AH

LED01M

LED02M

U,V,W CONNECTOR

U V W

1. Wait until inverter PCB DC voltage is discharged after main power off. 2. Pull out V, V, W COMP connector. 3. Set multi tester to resistance mode. 4. If the value between P and N terminal of IPM is short(0Ω) or open(hundreds MΩ), PCB needs to be replaced.(IPM damaged) 5. Set the multi tester to diode mode. 6. In case measured value is different from the table, PCB needs to be replaced.(PCB damaged). P

U

V

W

Nu Nv Nw

P

U

V

W

Nu Nv Nw

27

26

25

24

23 22 21

27

26

25

24

23 22 21

0.4 ~ 0.6 V

0.4 ~ 0.6 V

PFC_IPM chec U, V, W ➔ R S

CAUTION In case that the control box is opend and before checking electrical parts, it should be checked that the LED 01M, 02M turned off(wait 7 minutes after main power OFF), otherwise it may cause electrical shock.

Copyright ©2007 LG Electronics. Inc. All right reserved. Only for training and service purposes

LGE Internal Use Only

48

Multi-split: Inverter FM..AH

4. Trouble Shooting

■ FM49AH t/m FM57AH

U V W

LED01M

LED02M

CN(L)_BRWON

CN(N)_BLUE U,V,W CONNECTOR

1. Wait until inverter PCB DC voltage is discharged after main power off. 2. Pull out CN(L), CN(N) connectors and U,V,W COMP Connector. 3. Set multi tester to resistance mode. 4. If the value between P and N terminal of IPM is short(0Ω) or open(hundreds MΩ), PCB needs to be replaced.(IPM damaged) 5. Set the multi tester to diode mode. 6. In case measured value is different from the table, PCB needs to be replaced.(PCB damaged). P

U

V

W

Nu Nv Nw

P

U

V

W

Nu Nv Nw

27

26

25

24

23 22 21

27

26

25

24

23 22 21

0.4 ~ 0.6 V

0.4 ~ 0.6 V

PFC_IPM chec U, V, W ➔ R S

CAUTION In case that the control box is opend and before checking electrical parts, it should be checked that the LED 01M, 02M turned off(wait 7 minutes after main power OFF), otherwise it may cause electrical shock.

Copyright ©2007 LG Electronics. Inc. All right reserved. Only for training and service purposes

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LGE Internal Use Only

49

Multi-split: Inverter FM..AH

FM15AH t/m FM25AH 4. Trouble Shooting Display code

Title

Max. C/T

22

Cause of error

Input Over Current

Check point & Normal condition 1. Malfunction of Compressor 2. Blocking of Pipe 3. Low Voltage Input 4. Refrigerant, Pipe length, Blocked...

■ Error Diagnosis and Countermeasure Flow Chart Is installation condition normal?

No

Yes Are the resistance Between each phase and insulation resistance of Inverter compressor normal?

No

1. Check Pipe clogging/distortion 2. Check Covering (Indoor/Outdoor Unit) 3. Check EEV connector assemble condition/normal operation 4. Check refrigerant pressure → Reassemble or manage if abnormality found 1. Check resistance between each terminal of compressor 1.083~1.123Ω ±5% 2. Check insulation resistance between compressor terminal and pipe (over 50MΩ ) → Replace compressor if abnormality found

Yes Is compressor Wire connection condition normal?

No

1. Check inverter PCB assembly U,V,W connector connection condition 2. Check wire disconnection and wiring 3. Check compressor terminal connection condition (bad contact) → Reassemble if abnormality found

Yes

Is inverter PCB assembly power connection normal?

No

Check connection between inverter PCB assembly and bridge diode(misconnection, disconnection) → wiring again if abnormality found

No

Check R~S/S~T/T~R phase voltage is 380V ±10% R~N/S~N/T~N phase voltage is 220V ±10% → Check connection condition and wiring if power is abnormal.

No

Check inverter PCB assembly IPM normality → Replace inverter PCB assembly

Yes

Is input voltage normal?

Yes

Is inverter PCB assembly normal?

Yes Recheck power and installation condition

Copyright ©2007 LG Electronics. Inc. All right reserved. Only for training and service purposes

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50

FM15AH t/m FM25AH

Multi-split: Inverter FM..AH

4. Trouble Shooting

Check Point 1. Check the power source.(200~240V) 2. Check the fan operation is right. 3. Check the current. 4. Check the install condition. 5. Check the CT Sensor Output signal (Check output pin 1.2 of the CT Sensor : 5V )

Tester

CT Sensor Output (at the INVERTER PCB)

Copyright ©2007 LG Electronics. Inc. All right reserved. Only for training and service purposes

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LGE Internal Use Only

51

Multi-split: Inverter FM..AH

FM27AH t/m FM57AH 4. Trouble Shooting Display code

22

Title

Cause of error

Max. C/T

Input Over Current(27/30/40k-17A↑ 48/56k-29A↑ )

Check point & Normal condition 1. Malfunction of Compressor 2. Blocking of Pipe 3. Low Voltage Input 4. Refrigerant, Pipe length, Blocked...

■ Error Diagnosis and Countermeasure Flow Chart

Is installation condition normal?

No

Yes Are the resistance Between each phase and insulation resistance of Inverter compressor normal?

No

1. Check Pipe clogging/distortion 2. Check Covering (Indoor/Outdoor Unit) 3. Check EEV connector assemble condition/normal operation 4. Check refrigerant pressure → Reassemble or manage if abnormality found 1. Check resistance between each terminal of compressor (0.188 ±7%) 2. Check insulation resistance between compressor terminal and pipe (over 50MΩ ) → Replace compressor if abnormality found

Yes Is compressor Wire connection condition normal?

No

1. Check inverter PCB assembly U,V,W connector connection condition 2. Check wire disconnection and wiring 3. Check compressor terminal connection condition (bad contact) → Reassemble if abnormality found

Yes

Is inverter PCB assembly power connection normal?

No

Check connection between inverter PCB assembly and bridge diode(misconnection, disconnection) → wiring again if abnormality found

No

Check L~N phase is 220V ±15% → Check connection condition and wiring if power is abnormal

No

Check inverter PCB assembly IPM normality → Replace inverter PCB assembly

Yes

Is input voltage normal?

Yes

Is inverter PCB assembly normal?

Yes Recheck power and installation condition

Copyright ©2007 LG Electronics. Inc. All right reserved. Only for training and service purposes

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LGE Internal Use Only

52

FM27AH t/m FM57AH

Multi-split: Inverter FM..AH

4. Trouble Shooting

Check Point 1. Check the power source.(220V ±15%) 2. Check the fan operation is right. 3. Check the current. 4. Check the install condition. 5. Check the CT Sensor Output signal (27/30/40k - Check output the CT Sensor : DC 2.5±0.2V) (48/56k - Check output pin 1.2 of the CT Sensor : 5V )

Vdc < Input Power Source Check Point >

< Main PCB>

< Inverter PCB>

Copyright ©2007 LG Electronics. Inc. All right reserved. Only for training and service purposes



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LGE Internal Use Only

53

Multi-split: Inverter FM..AH

FM15AH t/m FM25AH 4. Trouble Shooting Display code

23

Title

DC Link Low voltage

Cause of error

• DC Link volt is below 300V

Check point & Normal condition • Check point & Normal condition • Check the TAB1 is connect. • At not operating : DC Link voltage(260V↑ ) • At Comp operating : DC Link voltage(500V↑ )

■ Error Diagnosis and Countermeasure Flow Chart Is DC Link voltage under 380V ?

No

Check the DC link Voltage AD Input of Inverter PCB If AD Input is strange, change the Inverter PCB (refer the next page.)

Yes

Is input voltage normal ?

No

R~S/S~T/T~R phase voltage is 400V ±10% R~N/S~N/T~N phase voltage is 220V ±10% → Check connection condition and wiring if power is abnormal.

No

Check connection from terminal block to Inverter PCB assembly CN_L1(R), CN_L2(S), CN_L3(T)

Yes

Is Inverter PCB assembly Power connection normal?

Yes

Is Inverter PCB Normal?

No

Replace inverter PCB assembly

Yes Recheck power and installation condition

Copyright ©2007 LG Electronics. Inc. All right reserved. Only for training and service purposes

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LGE Internal Use Only

54

FM15AH t/m FM27AH

Multi-split: Inverter FM..AH

4. Trouble Shooting

Check Point 1. Check the Tab1 connection condition. (Refer to outdoor wiring diagram) 2. Check the CN_L1(R), CN_L2(S), CN_L3(T) connection condition 3. Check the DC Link voltage at not operating(380V↑ ) 4. Check the DC Link voltage at Comp operating(500V↑ ) 5. Check DC Link Sensing Signal (Refer the Picture)

Vdc 500Vdc ±10% +

GND





GND

Tester

DC Link Voltage oltage INV



Copyright ©2007 LG Electronics. Inc. All right reserved. Only for training and service purposes

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LGE Internal Use Only

55

FM27AH t/m FM57AH 4. Trouble Shooting Display code

23

Multi-split: Inverter FM..AH

Title

DC Link Low voltage

Cause of error

• DC Link volt is below 140Vdc

Check point & Normal condition • Check point & Normal condition • Check theCN_(L),CN_(N) Connection. • At not operating : DC Link voltage(280V↑ ) • At Comp operating : DC Link voltage(340V↑ )

■ Error Diagnosis and Countermeasure Flow Chart No Check L~N Voltage is 220V±15%

Is input voltage normal ? Yes No Is Inverter PCB assembly Power connection normal?

Check connection from terminal block to Inverter PCB assembly CN(L), CN(N)

Yes No Is Inverter PCB Normal?

Replace inverter PCB assembly

Yes Recheck power and installation condition

Copyright ©2007 LG Electronics. Inc. All right reserved. Only for training and service purposes

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LGE Internal Use Only

56

FM27AH t/m FM57AH

Multi-split: Inverter FM..AH

4. Trouble Shooting

Check Point 1. Check the WCN_P(L),P(N) Connection condition at the Main PCB.(Refer to outdoor wiring diagram) 2. Check the DC Link voltage at not operating(280V↑ ) 3. Check the DC Link voltage at Comp operating(340V↑ ) 4. Check DC Link Sensing Signal :2.4~2.8V (Refer the Picture)

< Input Power Source Check Point > 27/30/40k

Vdc < Main PCB>

Vdc





Copyright ©2007 LG Electronics. Inc. All right reserved. Only for training and service purposes

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LGE Internal Use Only

57

Multi-split: Inverter FM..AH

4. Trouble Shooting

FM49AH t/m FM57AH Vdc

N GND

< Inverter PCB>

L





Vdc

DC_LINK GND



Copyright ©2007 LG Electronics. Inc. All right reserved. Only for training and service purposes

- 80 -

LGE Internal Use Only

58

Multi-split: Inverter FM..AH Display code

Title

24

Press S/W Open

Cause of error

• Low / High press S/W open.

4. Trouble Shooting Check point & Normal condition

• Check the connection CN_L/PRESS,H/PRESS • Check the components.

■ Error diagnosis and countermeasure flow chart Is high pressure switch connector connected to PCB?*

No

Connect securely

Yes

Is high pressure switch connector short during off time?**

No

Replace high pressure switch

Yes

Is SVC valve open?

No

Open SVC valve

Yes Is this error appeared again after reset?

No

Re-check momentary problem or not

Yes Is high pressure more than 2500kPa at manifold gauge?

No

Replace PCB

Yes Is high pressure of LGMV similar as at manifold gauge?

No

Replace high pressure sensor

Yes Check pipe is blocked or not and take measure

Copyright ©2007 LG Electronics. Inc. All right reserved. Only for training and service purposes

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LGE Internal Use Only

59

4. Trouble Shooting

Multi-split: Inverter FM..AH

Check Point 1. Check the connection of H/press switch 2. Check short or not at the connector of high pressure switch (Normal open) 27/30/40k

< Main PCB : Connection Check Point >

< Checking the Press switch >

48/56k

< Main PCB : Connection Check Point >

Copyright ©2007 LG Electronics. Inc. All right reserved. Only for training and service purposes

< Checking the H/press switch >

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LGE Internal Use Only

60

Multi-split: Inverter FM..AH

FM15AH t/m FM25AH 4. Trouble Shooting Display code

Title

25

Input voltage

Cause of error Abnomal Input Voltage (R,S,T -N /140Vac↓ , 300Vac ↑ )

Check point & Normal condition

Check the power source. • Check the components.

■ Error Diagnosis and Countermeasure Flow Chart Is input voltage normal?

No

R~S/S~T/T~R phase voltage is 400V ±10% R~N/S~N/T~N phase voltage is 220V ±10% → Check connection condition and wiring if power is abnormal.

Yes

Is Inverter PCB Normal?

No

Replace inverter PCB assembly

Yes Recheck power and installation condition

Tester

GND

< CH25 Check Point >

INPUT VOLTAGE VOL AGE INV



Copyright ©2007 LG Electronics. Inc. All right reserved. Only for training and service purposes

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LGE Internal Use Only

61

Multi-split: Inverter FM..AH

FM27AH t/m FM57AH Display code

Title

Cause of error

25

Input voltage

• Abnormal Input voltage (140Vac , 300Vac)

4. Trouble Shooting Check point & Normal condition

• Check the power source. • Check the components.

■ Error Diagnosis and Countermeasure Flow Chart Is input voltage normal ?

No

Check L~N Voltage is 220V±15%

Yes Is Inverter PCB Normal?

No

Replace inverter PCB assembly

Yes Recheck power and installation condition

Check Point 1. Check the Input Voltage (L–N ➔ 220V±10%) 2. Check Input Voltage Sensor output voltage (2.5Vdc±10%)

< Input Power Source Check Point >

Copyright ©2007 LG Electronics. Inc. All right reserved. Only for training and service purposes

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LGE Internal Use Only

62

4. Trouble Shooting

Multi-split: Inverter FM..AH

FM27AH t/m FM57AH

Vdc

< Inverter PCB>

< Input Voltage Sensing Check Point >

FM49AH t/m FM57AH

Vdc

INPUT(V) GND

< Input Voltage Sensing Check Point >

< Inverter PCB>

Copyright ©2007 LG Electronics. Inc. All right reserved. Only for training and service purposes

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LGE Internal Use Only

63

Multi-split: Inverter FM..AH

FM15AH t/m FM25AH Display code

Title

26

DC Compressor Position

Cause of error

• Compressor Starting fail error

4. Trouble Shooting Check point & Normal condition

• Check the connection of comp wire “U,V,W” • Malfunction of compressor • Check the component of “IPM”, detection parts.

■ Error Diagnosis and Countermeasure Flow Chart

Is installation condition normal?

No

1. Check Pipe clogging/distortion 2. Check Covering (Indoor/Outdoor Unit) 3. Check EEV connector assemble condition/normal operation 4. Check refrigerant pressure → Reassemble or manage if abnormality found

Yes Are the resistance Between each phase and insulation resistance of Inverter compressor normal?

No

1. Check resistance between each terminal of compressor (0.188 ±7%) 2. Check insulation resistance between compressor terminal and pipe (over 50MΩ ) → Replace compressor if abnormality found

Yes Is compressor Wire connection condition normal?

No

1. Check inverter PCB assembly U,V,W connector connection condition 2. Check wire disconnection and wiring 3. Check compressor terminal connection condition (bad contact) → Reassemble if abnormality found

No

Check inverter PCB assembly IPM normality → Replace inverter PCB assembly

Yes

Is inverter PCB assembly normal?

Yes Recheck power and installation condition

Copyright ©2007 LG Electronics. Inc. All right reserved. Only for training and service purposes

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LGE Internal Use Only

64

Multi-split: Inverter FM..AH

FM27AH t/m FM57AH Display code

Title

26

DC Compressor Position

Cause of error

• Compressor Starting fail error

4. Trouble Shooting Check point & Normal condition

• Check the connection of comp wire “U,V,W” • Malfunction of compressor • Check the component of “IPM”, detection parts.

■ Error Diagnosis and Countermeasure Flow Chart

Is installation condition normal?

No

1. Check Pipe clogging/distortion 2. Check Covering (Indoor/Outdoor Unit) 3. Check EEV connector assemble condition/normal operation 4. Check refrigerant pressure Reassemble or manage if abnormality found

Yes Are the resistance Between each phase and insulation resistance of Inverter compressor normal?

No

1. Check resistance between each terminal of compressor (1.083~1.123Ω ±5%) 2. Check insulation resistance between compressor terminal and pipe (over 50M ) Replace compressor if abnormality found

Yes Is compressor Wire connection condition normal?

No

1. Check inverter PCB assembly U,V,W connector connection condition 2. Check wire disconnection and wiring 3. Check compressor terminal connection condition (bad contact) Reassemble if abnormality found

No

Check inverter PCB assembly IPM normality Replace inverter PCB assembly

Yes

Is inverter PCB assembly normal?

Yes Recheck power and installation condition

Check Point 1. Check the connection condition of PCB. 2. Check the connection condition of Comp. U,V,W wire. 3. Check the comp resistor and insulation resistance .

WVU

4. Check the IPM.(Refer 106 page) 5. Check the pressure of refrigerant. 6. Check the Service Valve Open.

Copyright ©2007 LG Electronics. Inc. All right reserved. Only for training and service purposes

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LGE Internal Use Only

65

Multi-split: Inverter FM..AH

4. Trouble Shooting Display code

27

Title

Cause of error

Check point & Normal condition

1. Overload operation (Pipe clogging/Covering/EEV defect/Ref. overcharge) 2. Compressor damage (Insulation damage/Motor Inverter PCB input damage) current is over100A(peak) 3. Input voltage abnormal (L,N) for 2us 4. Power line assemble condition abnormal 5. Inverter PCB assembly Damage (input current sensing part)

AC Input Instant over Current Error

■ Error Diagnosis and Countermeasure Flow Chart Is installation condition normal?

No

Yes

1.Check Pipe clogging/distortion 2.Check Covering (Indoor/Outdoor Unit) 3.Check EEV connector assemble condition/normal operation 4.Check refrigerant pressure → Reassemble or manage if abnormality found

No

Check L~N phase voltage is 220V ±15% → Check connection condition and wiring if power is abnormal

No

1.Check L,N connection condition 2.Check wire disconnection and wiring → Reassemble if abnormality found

No

1.Check inverter PCB assembly U,V,W connector connection condition 2.Check wire disconnection and wiring 3.Check compressor terminal connection condition(bad contact) → Reassemble if abnormality found

Is input voltage normal?

Yes

Is AC input Wire connection condition normal? Yes Is compressor Wire connection condition normal? Yes

Is inverter PCB assembly normal?

No Check inverter PCB assembly PFCM normality → Replace inverter PCB assembly

Yes Recheck power and installation condition

※ PFCM Moudle checking method ① Set the multi tester to diode mode. ② Check short between input signal pin which are placed below PFC Module ③ Replace PCB assembly if it is short between pins except No.4,5 pins.

Signal pin

CAUTION PFCM module No.4,5 pins are internal short state.

Copyright ©2007 LG Electronics. Inc. All right reserved. Only for training and service purposes

8 - 86 -

1

LGE Internal Use Only

66

Multi-split: Inverter FM..AH

FM27AH t/m FM57AH Display code

Title

Cause of error

28

Inverter DC link high voltage error

Inv PCB DC link voltage supplied over 420V

4. Trouble Shooting Check point & Normal condition

1. Input voltage abnormal (L~N) 2. ODU inverter PCB damage(DC Link voltage sensing part)

■ Error Diagnosis and Countermeasure Flow Chart No Is input voltage normal ?

Check L~N Voltage is 220V±15%

Yes Is Inverter PCB assembly Power connection normal?

No

Check connection from terminal block to Inverter PCB assembly CN(L), CN(N)

Yes No Is Inverter PCB Normal?

Replace inverter PCB assembly

Recheck power and installation condition

Copyright ©2007 LG Electronics. Inc. All right reserved. Only for training and service purposes

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LGE Internal Use Only

67

FM27AH t/m FM57AH 4. Trouble Shooting

Multi-split: Inverter FM..AH

Check Point 1. Check the CN_(L),CN_(N) Connection condition at the Inverter PCB.(Refer to outdoor wiring diagram) 2. Check the DC Link voltage at not operating(280V↑ ) 3. Check the DC Link voltage at Comp operating(340V↑ ) 4. Check DC Link Sensing Signal : 2.4~2.8V (Refer the Picture)

< Input Power Source Check Point > 27/30/40k

Vdc < Main PCB>

Vdc





Copyright ©2007 LG Electronics. Inc. All right reserved. Only for training and service purposes

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LGE Internal Use Only

68

Multi-split: Inverter FM..AH

FM27AH t/m FM57AH

4. Trouble Shooting

48/56k Vdc

N GND

< Inverter PCB>

L





Vdc

DC_LINK GND



Copyright ©2007 LG Electronics. Inc. All right reserved. Only for training and service purposes

- 89 -

LGE Internal Use Only

69

Multi-split: Inverter FM..AH

4. Trouble Shooting Display code

29

Title

Inverter compressor over current

Cause of error

Check point & Normal condition

1. Overload operation (Pipe clogging/Covering/EEV defect/Ref. overcharge) Inverter compressor input 2. Compressor damage(Insulation damage/Motor current is over 30A damage) 3. Input voltage low 4. ODU inverter PCB assembly damage

■ Error Diagnosis and Countermeasure Flow Chart Is installation condition normal?

No

Yes Are the resistance Between each phase and insulation resistance of Inverter compressor normal?

No

1. Check Pipe clogging/distortion 2. Check Covering (Indoor/Outdoor Unit) 3. Check EEV connector assemble condition/normal operation 4. Check refrigerant pressure → Reassemble or manage if abnormality found 1. Check resistance between each terminal of compressor (0.188 ±7%) 2. Check insulation resistance between compressor terminal and pipe (over 50MΩ ) → Replace compressor if abnormality found

Yes Is compressor Wire connection condition normal?

No

1. Check inverter PCB assembly U,V,W connector connection condition 2. Check wire disconnection and wiring 3. Check compressor terminal connection condition (bad contact) → Reassemble if abnormality found

Yes

Is input voltage normal?

No

Check L~N phase is 220V ±15% → Check connection condition and wiring if power is abnormal

No

Check inverter PCB assembly IPM normality → Replace inverter PCB assembly

Yes

Is inverter PCB assembly normal?

Yes Recheck power and installation condition

Copyright ©2007 LG Electronics. Inc. All right reserved. Only for training and service purposes

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LGE Internal Use Only

70

Multi-split: Inverter FM..AH

4. Trouble Shooting Display code

Title

32

D-pipe (Inverter) temp. high (105°C↑ )

33

D-pipe (Constant) temp. high (105°C↑ )

Cause of error

Check point & Normal condition

• Discharge sensor (Inverter) temp. high

• Check the discharge pipe sensor for INV. • Check the install condition for over load. • Check the leakage of refrigerant. • Check the SVC V/V open.

• Discharge sensor (Cons.) temp. high

• Check the discharge pipe sensor for Cons. • Check the install condition for over load. • Check the leakage of refrigerant. • Check the SVC V/V open.

D-Pipe temp. Toff(105) °C T2(95) °C T1(90) °C

COMP Frequency Normal (Hz) LEV Openness (Pulse)

Normal

Normal

OFF

Normal

OFF Control

Check Point • CH 32

• CH 33

1. Check the install condition for over load.

1. Check the install condition for over load.

2. Check the SVC V/V open.

2. Check the SVC V/V open.

3. Check the leakage of refrigerant.

3. Check the leakage of refrigerant. 4. Check the constant compressor. (same with CH21)

Copyright ©2007 LG Electronics. Inc. All right reserved. Only for training and service purposes

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LGE Internal Use Only

71

Multi-split: Inverter FM..AH Display code

Title

39

Transmission Error Between (PFC Micom → INV Micom)

Cause of error

4. Trouble Shooting Check point & Normal condition

1. Micom defect/Circuit defect 2. Different Micom S/W Version 3. ODU inverter PCB assembly damage

Communication Error Between PFC Micom and INV Micom.

■ Error Diagnosis and Countermeasure Flow Chart

Is PFC Micom & INV Micom S/W Program normal?

No

Upgrade Micom Program

Yes

Is Inverter PCB assembly normal?

No

Replace inverter PCB assembly

Yes

Recheck power and installation condition

Copyright ©2007 LG Electronics. Inc. All right reserved. Only for training and service purposes

- 115 -

LGE Internal Use Only

72

Multi-split: Inverter FM..AH

FM15AH t/m FM25AH 4. Trouble Shooting Display code

40

Title

C/T Sensor Error

Cause of error

Check point & Normal condition • Malfunction of current detection circuit. (Open / Short) • The voltage of "C01N" Is 4.0Vdc(25A) . • Check CT Sensor output voltage : 2.5Vdc ±5%

• Initial current error

■ Error Diagnosis and Countermeasure Flow Chart Is CT Sensor Output is right?

No

If the CT Sensor output is not 2.5Vdc°æ5% Replace the Inverter PCB

No

Check the input voltage source (Is nomal the offset of R-N,T-N voltage)

Yes

Is input voltage normal? Yes Recheck the Inverter PCB and installation condition

Tester

CT Sensor Output (at the INVERTER PCB)

GND

COMP CURRENT U,V ,W U,V,W

INPUT VOL AGE INV VOLTAGE

Copyright ©2007 LG Electronics. Inc. All right reserved. Only for training and service purposes

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LGE Internal Use Only

73

Multi-split: Inverter FM..AH

FM27AH t/m FM57AH Display code

Title

C/T Sensor Error

40

4. Trouble Shooting

Cause of error

Check point & Normal condition

• Initial current error

• Malfunction of current detection circuit. (Open / Short) • Check CT Sensor output voltage : 2.5Vdc ±5%

■ Error Diagnosis and Countermeasure Flow Chart

Is input voltage normal ?

No

Check L~N Voltage is 220V±15%

Yes Is Inverter PCB Normal?

No

Replace inverter PCB assembly

Yes Recheck power and installation condition

Check Point 1. Check the Input Voltage (L–N ➔ 220V±10%) 2. Check Input Voltage Sensor output voltage (2.5Vdc±10%)

< Input Power Source Check Point >

Copyright ©2007 LG Electronics. Inc. All right reserved. Only for training and service purposes

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LGE Internal Use Only

74

4. Trouble Shooting

Multi-split: Inverter FM..AH

FM27AH t/m FM41AH

Vdc

1 2 3

< Inverter PCB>

< CT Sensing Check Point >

FM49AH t/m FM57AH

Vdc

INPUT(CT) GND

< CT Sensing Check Point >

< Inverter PCB>

Copyright ©2007 LG Electronics. Inc. All right reserved. Only for training and service purposes

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LGE Internal Use Only

75

Multi-split: Inverter FM..AH

4. Trouble Shooting

Display code

Title

41

D-pipe sensor (Inverter)

• Open / Short • Soldered poorly • Internal circuit error

• Normal resistor : 200KΩ / at 25°C (Unplugged) • Normal voltage : 4.5Vdc / at 25°C (plugged)

44

Air sensor

• Open / Short • Soldered poorly • Internal circuit error

• Normal resistor : 10KΩ / at 25°C (Unplugged) • Normal voltage : 2.5Vdc / at 25°C (plugged)

45

Condenser Pipe sensor

• Open / Short • Soldered poorly • Internal circuit error

• Normal resistor : 5KΩ / at 25°C (Unplugged) • Normal voltage : 2.5Vdc / at 25°C (plugged)

46

Suction Pipe sensor

• Open / Short • Soldered poorly • Internal circuit error

• Normal resistor : 5KΩ / at 25°C (Unplugged) • Normal voltage : 2.5Vdc / at 25°C (plugged)

47

D-pipe sensor (Constant)

• Open / Short • Soldered poorly • Internal circuit error

• Normal resistor : 200KΩ / at 25°C (Unplugged) • Normal voltage : 4.5Vdc / at 25°C (plugged)

65

Heat sink sensor

• Open / Short • Soldered poorly • Internal circuit error

• Normal resistor : 10KΩ / at 25°C (Unplugged) • Normal voltage : 2.5Vdc / at 25°C (plugged)

Cause of error

Check point & Normal condition

Check Point 1. Estimate the resistance of each sensor.(Unplugged) 2. Estimate the voltage of each sensor.(Plugged) 3. If the resistance of the sensor is 0 kΩ or ∞, then sensor is abnormal.

Ω

If the voltage of the sensor is 0 V or 5Vdc, then sensor is abnormal.

Copyright ©2007 LG Electronics. Inc. All right reserved. Only for training and service purposes

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LGE Internal Use Only

76

Multi-split: Inverter FM..AH

FM15AH t/m FM25AH 4. Trouble Shooting Display code

Title

51

Over capacity

60

EEPROM Check sum

Cause of error

Check point & Normal condition

• Over capacity Combination

• Check the indoor unit capacity. • Check the combination table.

• Check sum error

• Check the PCB ASM P/No. • Check the poor soldering.

Model

Gross max. capacity

A2UW146FA3

21k

Max. single indoor unit capacity

A2UW166FA0 A2UW166FA1

24k

12k

A3UW186FA0 A3UW216FA3 A4UW246FA3

33k

18k

Check Point • CH 51

• CH 60

1. Check the indoor unit capacity.

1. Check the insertion condition of EEPROM. 2. Check the poor soldering

Copyright ©2007 LG Electronics. Inc. All right reserved. Only for training and service purposes

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LGE Internal Use Only

77

Multi-split: Inverter FM..AH

FM41 t/m FM57AH 4. Trouble Shooting Display code

Title

51

Over capacity

• Over capacity

• Check the indoor unit capacity. • Check the combination table.

60

Over capacity

• Check sum error

• Check the PCB ASM P/No. • Check the poor soldering.

Cause of error

Model

Gross Max. Capacity[Btu/h]

A7UW428FA3

54k

A8UW488FA3

62k

A9UW548FA3

73k

Check point & Normal condition

Max. Single Indoor Unit Capacity[Btu/h] 24k

Check Point • CH 51

• CH 60

1. Check the indoor unit capacity.

1. Check the insertion condition of EEPROM. 2. Check the poor soldering

Copyright ©2007 LG Electronics. Inc. All right reserved. Only for training and service purposes

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LGE Internal Use Only

78

Multi-split: Inverter FM..AH Display code

Title

Cause of error

52

Transmission error between (Inverter PCB ➔ Main PCB)

Main controller of Master unit of Master unit can’t receive signal from inverter controller

4. Trouble Shooting Check point & Normal condition

1. Power cable or transmission cable is not connected 2. Defect of outdoor Main fuse/Noise Filter 3. Defect of outdoor Main / inverter PCB

■ Error diagnosis and countermeasure flow chart Is transmission LED (Yellow) of inverter compressor PCB on?

No

Is noise filter or fuse normal?

No

Replace noise filter or fuse

Yes

Yes

Replace inverter compressor PCB

Is transmission cable connected correctly?

No Re-connect transmission cable

Yes

No Is MAIN PCB normal?

Replace MAIN PCB

Yes

Replace inverter compressor PCB

Check Point - Check the Transmission connector and LED (Main & Inverter)

48/56k



Copyright ©2007 LG Electronics. Inc. All right reserved. Only for training and service purposes



- 93 -

LGE Internal Use Only

79

Multi-split: Inverter FM..AH Display code

Title

54

3-phase wrong wiring of main outdoor unit

Cause of error

4. Trouble Shooting Check point & Normal condition

• 3-phase wrong wiring of outdoor unit (Reverse Phase /omission of phase)

• Abnormal Main PCB • No connection of CN_Phase • Changed R, S, T connection order

■ Error Diagnosis and Countermeasure Flow Chart No

Is PCB connection Normal? Yes

No

Is input voltage normal ? Yes

1. Check the Connection condition of PCBs 1) Input &Output (R,S,T,N) wire Connection of Noise Filter. 2) Check reverse connecting and non connecting for CN-L1(R), CN-L2(S), CN-L3(T) of the Inverter PCB 3) Check the CN-AC-220V Connector of the Inverter PCB and T-N connector of the Noise Filter 2. Check the connection or damage of power source fuses.

R~S/S~T/T~R phase voltage is 380V °æ 10% R~N/S~N/T~N phase voltage is 220V °æ10% Check connection condition and wiring if power is abnormal.

Recheck power and installation condition

T-N R

S

T

N

R

S

T

Fuse

R S T

N

R

G

S T

N

CN-L3(T) CN-L1(R) CN-AC-220V

CN-L2(S)

Copyright ©2007 LG Electronics. Inc. All right reserved. Only for training and service purposes

- 119 -

LGE Internal Use Only

80

FM27AH t/m FM57AH 4. Trouble Shooting Display code

60

Multi-split: Inverter FM..AH

Title

Cause of error

Check point & Normal condition 1. EEPROM contact defect/wrong insertion 2. Different EEPROM Version 3. ODU Inverter & Main PCB assembly damage

Inverter PCB & Main EEPROM Access error EEPROM check sum error and Check SUM error

■ Error Diagnosis and Countermeasure Flow Chart

Is EEPROM insertion normal?

No

1.Check EEPROM insert direction/connection condition 2.Check EEPROM Check SUM → Replace if abnormality found

Yes

Is inverter PCB assembly normal?

No

Replace inverter PCB assembly

Yes

MAIN PCB assembly normal?

No

Replace MAIN PCB assembly

Yes Recheck power and installation condition

Check Point - Check the EEPROM Check sum & Direction

27/30/40k





Copyright ©2007 LG Electronics. Inc. All right reserved. Only for training and service purposes

- 94 -

LGE Internal Use Only

81

Multi-split: Inverter FM..AH

4. Trouble Shooting

FM49AH t/m FM57AH







Copyright ©2007 LG Electronics. Inc. All right reserved. Only for training and service purposes

- 95 -

LGE Internal Use Only

82

Multi-split: Inverter FM..AH

4. Trouble Shooting Display code

Title

Cause of error

61

Condenser pipe sensor temp. high

• Condenser pipe sensor detected high temp.(65°C)

62

Heat sink sensor temp. high

Check point & Normal condition

• Check the load condition. • Check the sensor of Condenser pipe sensor.

• Heat sink sensor detect- • Check the Heat sink sensor (10kΩ ±10% at 25°C) ed high temp.(85°C) • Check that outdoor fan is driving rightly

Gd`sRhmjပ౜ Snee

8/°C

S1

74°C

S0

7/°C

ქኩ༯ ZGy\

໬Ⴓ ໎ཙ ქኩ༯ ხᄅ

α Gy Cnvm

ጒ੾ ხᄅ

α Gy Cnvm

NEE

α Gy Cnvm

໬Ⴓ ქኩ༯

Comp frequecy control accoding to heatsink temp.

■ Comp frequency control according to heat sink temp. Is normal heatsink sensor connecting ?

No

Connect the heatsink sensor right

Yes Is normal heatsink sensor ? (10kΩ ±10% at 25°C)

No

Replace the heatsink sensor

Yes

Is normal Inverter PCB ?

No

Replace the heatsink sensor

Yes Recheck power and installation condition

Copyright ©2007 LG Electronics. Inc. All right reserved. Only for training and service purposes

- 120 -

LGE Internal Use Only

83

4. Trouble Shooting Display code

65

Multi-split: Inverter FM..AH

Title

Heatsink High error

Cause of error

Inverter PCB heatsink sensor is open or short

Check point & Normal condition 1. ODU fan locking 2. Heatsink assembly of INV PCB assemble condition abnormal 3. Defect of temperature sensing circuit part defect of INV PCB

■ Error Diagnosis and Countermeasure Flow Chart

Is installation condition normal ?

No

1. Check fan locking 2. Check covering of heat exchanger 3. Check distance between ODU and obstacles 4. Check pipe distortion and abnormality 5. Check service valve is opened → Eliminate causes for abnormal condition

Yes

Is assemble condition of INV PCB heatsink normal ?

No

Check assemble condition between INV PCB heatsink and PFC & IPM module → Reassemble if abnormality found

Yes

Is PCB temperature sensing part normal ?

No

Check resistance between NO.19 pin and NO.20 pin of PFC module Check resistance between NO.24 pin and NO.25 pin of PFC module → 7KΩ ±10%(at 25°C) → Replace PCB if abnormality found

Check Point 1. Check resistance between No.19 pin and NO.20 pin of PCB PFC module 2. Check resistance between No.24 pin and NO.25 pin of PCB PFC module - only 48/56k 3. Resistance value should be in 7kΩ ±10%.(at 25°C). 4. Check the PFC Module No.19, 20 and IPM Module No.24, 25 pin soldering condition.

Copyright ©2007 LG Electronics. Inc. All right reserved. Only for training and service purposes

- 98 -

LGE Internal Use Only

84

Multi-split: Inverter FM..AH

4. Trouble Shooting

FM27AH t/m FM40AH

PFCM : Measuring resistance between No.19,20 pin

FM49AH t/m FM57AH

PFCM : Measuring resistance between No.19,20 pin

Copyright ©2007 LG Electronics. Inc. All right reserved. Only for training and service purposes

- 99 -

IPM : Measuring resistance between No.24,25 pin

LGE Internal Use Only

85

Multi-split: Inverter FM..AH

FM15AH t/m FM25AH

4. Trouble Shooting

Display code

Title

Cause of error

Check point & Normal condition

67

Outdoor fan lock

• Outdoor fan is not operating

• Check the fan condition. • Check the fan connector • Check the fan control part of the INVERTER PCB

■ Error Diagnosis and Countermeasure Flow Chart CH67(Outdoor fan lock) occurrence

Is fan connector condition right ?

No

Do right fan connector condition

Yes

No

Is Fan motor nomal?

Change abnomal motor

Yes Replace inverter PCB assembly







Copyright ©2007 LG Electronics. Inc. All right reserved. Only for training and service purposes

- 121 -

LGE Internal Use Only

86

FM27AH t/m FM57AH 4. Trouble Shooting Display code

67

Multi-split: Inverter FM..AH

Title

Fan Lock Error

Cause of error

Check point & Normal condition

1. ODU fan locking Fan RPM is 10RPM or 2. Heatsink assembly of INV PCB assemble condiless for 5 sec. when ODU tion abnormal fan starts or 40 RPM or 3. Defect of temperature sensing circuit part defect less after fan starting. of INV PCB

■ Error Diagnosis and Countermeasure Flow Chart Is ODU Fan Motor Assemble condition normal?

No

Check ODU Fan Motor assemble condition and fan locking → Reassemble or replace if abnormality found

No

1. Set the multi tester to diode mode. 2. Check voltage between 1pin and 4pin of Fan Motor (1±0.2V) 3. Replace Inverter PCB if abnormality found.

Yes

Is ODU Fan Motor normal?

Yes

Is wire connection of ODU Fan Motor wire normal?

No

Check wiring between OUD fan motor and Inverter PCB ( Check if Hall Senor and Motor output terminal color is matched) → Reassemble if abnormality found

Yes

Is Inverter PCB assembly normal?

No

Replace Inverter PCB assembly

Yes Recheck power and installation condition

Check Point 1. Check voltage between 1pin and 4pin of Fan Mortor connector (Tester diode mode) 2. Voltage vaule should be in 1V ±0.2V.

Copyright ©2007 LG Electronics. Inc. All right reserved. Only for training and service purposes

- 100 -

LGE Internal Use Only

87

Multi-split: Inverter FM..AH

4. Trouble Shooting

FM27AH t/m FM41AH Check voltage betwen 1pin and 4pin of fan motor

Fan motor connector Tester



FM49AH t/m FM57AH



Copyright ©2007 LG Electronics. Inc. All right reserved. Only for training and service purposes

- 101 -

LGE Internal Use Only

88

Multi-split: Inverter FM..AH

4. Trouble Shooting Display code

73

Title

AC input instant over current error (Matter of software)

Cause of error

Check point & Normal condition

Inverter PCB input power current is over 48A(peak) for 2ms

1. Overload operation (Pipe clogging/Covering/EEV defect/Ref.overcharge) 2. Compressor damage (Insulation damage/Motor damage) 3. Input voltage abnormal (L, N) 4. Power line assemble condition abnormal 5. Inverter PCB assembly damage (input current sensing part)

■ Error Diagnosis and Countermeasure Flow Chart Is installation condition normal?

No

Yes

1.Check Pipe clogging/distortion 2.Check Covering (Indoor/Outdoor Unit) 3.Check EEV connector assemble condition/normal operation 4.Check refrigerant pressure → Reassemble or manage if abnormality found

No

Check L~N phase voltage is 220V ± 10% → Check connection condition and wiring if power is abnormal

No

1.Check L,N connection condition 2.Check wire disconnection and wiring → Reassemble if abnormality found

No

1.Check inverter PCB assembly U,V,W connector connection condition 2.Check wire disconnection and wiring 3.Check compressor terminal connection condition(bad contact) → Reassemble if abnormality found

Is input voltage normal?

Yes

Is AC input Wire connection condition normal? Yes

Is compressor Wire connection condition normal? Yes

Is inverter PCB assembly normal?

No Check inverter PCB assembly IPM normality → Replace inverter PCB assembly

Yes Recheck power and installation condition

Copyright ©2007 LG Electronics. Inc. All right reserved. Only for training and service purposes

- 102 -

LGE Internal Use Only

89

Multi-split: Inverter FM..AH

4. Trouble Shooting

27/30/40k

N

L

< Noise Filter wiring Check Point >

N L

< Main PCB wiring Check Point >

< Input Power Source Check Point >

Copyright ©2007 LG Electronics. Inc. All right reserved. Only for training and service purposes

- 103 -

LGE Internal Use Only

90

Multi-split: Inverter FM..AH

4. Trouble Shooting 48/56k

N

L

< Noise Filter wiring Check Point >

L

N

N L

< Input Power Source Check Point >

Copyright ©2007 LG Electronics. Inc. All right reserved. Only for training and service purposes

< Inverter PCB wiring Check Point >

- 104 -

LGE Internal Use Only

91

LG

Multi-split Variabel (aan/uit) M..AC/AH

92

Multi-split: Aan / Uit M..AC / AH

Functions

Signal Receptor Receives the signals from the remote controller.(Signal receiving sound: two short beeps or one long beep.) Operation Indication Lamps : Lights up during the system operation. : Lights up during Sleep Mode Auto operation. : Lights up during Timer operation. : Lights up during Defrost Mode or Hot Start operation (Heat pump model only) : Lights up during outdoor unit operation. (Cooling model only)

On/Off Sleep Mode Timer Signal receptor

Defrost Mode

OUT OUTDOOR UNIT DOOR OPERATION

Operation indication lamps

Receives the signals from the remote controller.(Signal receiving sound: two short beeps or one long beep.) Operation Indication Lamps : Lights up during the system operation. : Lights up during Sleep Mode Auto operation. Timer : Lights up during Timer operation. Defrost Mode : Lights up during Defrost Mode or Hot Start operation.(Heat pump model only) Outdoor unit operation : Lights up during outdoor unit operation.(Cooling model only) PLASMA : Indicate PLASMA purifier operation. On/Off

Sleep Mode

Operation indication lamps

Self-diagnosis Function ■ Error Indicator • The function is to self-diagnoisis airconditioner and express the troubles identifically if there is any trouble. • Error mark is ON/OFF for the operation LED of evaporator body in the same manner as the following table. • If more than two troubles occur simultaneously, primarily the highest trouble fo error code is expressed. • After error occurrence, if error is released, error LED is also released simultaneously. • To operate again on the occurrence of error code, be sure to turn off the power and then turn on. • Having or not of error code is different from Model. Error Code

1 2 5

Error LED (Indoor body operation LED) 5sec

(once) 3sec

3sec

3sec

(twice) 3sec

3sec (5times)

(6times) 3sec (7times)

7

• Indoor air temperature thermistor open/short.

• Indoor air TH ass'y check

• Indoor inlet pipe temperature thermistor open/short.

• Indoor inlet pipe TH ass'y check

• Poor communication

• Communication line/circuit

• Indoor outlet pipe temperature thermistor open/shor

• Indoor outlet pipe TH ass'y check

• Defferent Operation (Simultanueous operation of cooling and heating.

• Operate indoor units only heating or cooling mode.

3sec

• Indoor EEP ROM data (Art type only)

• Replace main PCB DC ASM

• Outdoor air temperature thermistor open/short

• Outdoor air TH ass'y check

• Outdoor pipe themperature thermistor open/short

• Outdoor pipe TH ass'y check

• Overload combination

• Indoor unit combination check (Refer to Max. capacity)

(9times)

9

3sec

3sec

3sec

45 3sec

51

SVC check point

3sec

6

44

Error contents

3sec

3sec

: ten digits : one digits

93

Multi-split Multi-split tot 2005 A2-C.. A3-C.. A2-H.. A3-H.. LM..

94

Multi-split: Aan / Uit voor 2005 (modellen, zie pag. 105)

Display Function 1. Heating Model

2. Cooling Model Operation Indicator

Operation Indicator • Cooling, Soft Dry, Fan, Heating

• Cooling, Soft Dry, Fan

Sleep Timer Indicator

Sleep Timer Indicator

• Sleep Mode

• Sleep Mode Timer Indicator

Timer Indicator • Timer Mode

• Timer Mode Compressor on Indicator

Defrost Indicator

OUT DOOR

• Hot-start, Defrost

Self-diagnosis Function ■ Error Indicator • The function is to self-diagnoisis airconditioner and express the troubles identifically if there is any trouble. • Error mark is ON/OFF for the operation LED of evaporator body in the same manner as the following table. • If more than two troubles occur simultaneously, primarily the highest trouble fo error code is expressed. • After error occurrence, if error is released, error LED is also released simultaneously. • To operate again on the occurrence of error code 12, be sure to pull out power cord and then re-insert. • Having or not of error code is different from Model. Error Code

1 2

Error LED (Indoor body operation LED)

Error contents

• Indoor suction temperature thermistor open/short. • Indoor TH ass'y check • Indoor pipe temperature thermistor open/short. • Outdoor suction temperature thermistor open/short. • Outdoor TH ass'y • Outdoor pipe temperature check thermistor open/short. • Abnormal operation of multi product. • Resetting of remocon (Simultanueous operation of operating mode cooling and heating)

(once) 3sec (twice)

3sec

3sec (3times)

3sec

3sec

3 3sec (5times)

3sec

• Poor communication

5 (once)

3sec (twice)

(once)

12 3sec

3sec

3sec

SVC check point

(twice)

• Communication line/circuit check

• Primarily check • Misconnection of connecting refrigerant pressure cables • Connecting pipe check • Connecting cable check

95

LG

RAC Standaard wandunit (aan/uit & Inverter) Art Cool Deluxe (aan/uit & Inverter) (hoge wand) Art Cool Panel (aan/uit & Inverter)

96

RAC Standaard wandunit (aan/uit) Alle typen/uitvoeringen o.a: LS-J.. / LS-K.. / LS-L.. S..ACL / S..AH / S..ACP / S..AHP G..AH

ART COOL Panel / Deluxe (aan/uit) LS-P.... .. A09/12/18AH* C07/09/12AH*

97

RAC: AAN / UIT Standaard wandunit, Panel & Deluxe

Operation

Display Function 1. Heating Model

2. Cooling Model Operation Indicator

Operation Indicator • Cooling, Soft Dry, Fan, Heating

• Cooling, Soft Dry, Fan Compressor on Indicator

Deicer Indicator

OUT DOOR

• Hot-start, Deice

Self-diagnosis Function Error Code 1

Error Display LED (Indoor body operation LED) (once) 3sec

3sec

3sec

Error contents • Indoor room temperature thermistor open/short • Indoor pipe temperature thermistor open/short.

SVC check point • Indoor Thermistor assembly check

98

LG

RAC Standaard wandunit Inverter LS-N.... LS-Q.... LS-R.... S..AN S..AW

99

RAC: Wandunit Inverter LS-N/Q/R, S..AN & S..AW

Troubleshooting Guide

Self-diagnosis function 1. The malfunction indicator of indoor (see the operating LED of the INDOOR) Error Code

The cause of malfunction

Malfunction indicator

The operating state

Indoor TH. is short or open.

The operating LED will be blinking once.

Keep operating state.

Outdoor TH. is short or open.

The operating LED will be blinking twice.

Keep operating state.

4

Temp. of Heat sink is over 95°C. /Heat sink TH. is short or open.

The operating LED will be blinking 4 times.

Restart compressor when Heat sink Temp is 85°C below.

5

Comunication error (serial comunication).

The operating LED will be blinking 5 times.

The operation is off(enable to restart by remote controller).

DC peak error.

The operating LED will be blinking 6 times.

Compressor will be turned off immediately. (not enable to restart by remote controller)

7

Running current is overloaded. (CT2)

The operating LED will be blinking 7 times.

Compressor will be turned off immediately. (not enable to restart by remote controller)

8

Indoor fan lock error (BLDC fan model)

The operating LED will be blinking 8 times.

The operation is off(enable to restart by remote controller).

9

Outdoor fan lock error (BLDC fan model)

The operating LED will be blinking 9 times.

The operation is off(enable to restart by remote controller).

D-PIPE TH is short or open.

The operating LED will be blinking 10 times.

Compressor will be turned off immediately. (restart compressor when D-PIPE TH. is recovred)

1

2

6

10

❈ Error code ➅, ➆ can’t be operated unless the power cord is removed.

2. The malfunction indicator of outdoor (see the LED01M on the outdoor PCB ass’y) Error Code

The cause of malfunction

Malfunction indicator

Indoor TH. is short or open.

The LED01M will be blinking twice.

Keep operating state.

4

Temp. of Heat sink is over 95°C, or Heat sink TH. is shortor open.

The LED01M will be blinking 4 times.

Restart compressor when heat sink Temp. is 85°C below.

5

Comunication error (serial comunication).

The LED01M will be blinking 5 times.

The operation is off(enable to restart by remote controller).

DC peak error.

The LED01M will be blinking 6 times.

Compressor will be turned off immediately. (not enable to restart by remote controller)

7

Running current is overloaded.

The LED01M will be blinking 7 times.

Compressor will be turned off immediately. (not enable to restart by remote controller)

9

Outdoor fan lock error (BLDC fan model)

The LED01M will be blinking 9 times.

The operation is off(enable to restart by remote controller).

D-PIPE TH is short or open.

The LED01M will be blinking 10 times.

Compressor will be turned off immediately. (restart compressor when D-PIPE TH. is recovered)

2

6

10

The operating state

100

RAC ART COOL Deluxe Inverter C09AW* C12AW*

101

RAC: ART COOL Inverter C09AW* & C12AW*

Troubleshooting Guide

Self-diagnosis function 1. The malfunction indicator of indoor (see the operating LED of the INDOOR) Error Code

The cause of malfunction

Malfunction indicator

The operating state

Indoor TH. is short or open.

The operating LED will be blinking once.

Keep operating state.

Outdoor TH. is short or open.

The operating LED will be blinking twice.

Keep operating state.

4

Temp. of Heat sink is over 95°C. /Heat sink TH. is short or open.

The operating LED will be blinking 4 times.

Restart compressor when Heat sink Temp is 85°C below.

5

Comunication error (serial comunication).

The operating LED will be blinking 5 times.

The operation is off(enable to restart by remote controller).

DC peak error.

The operating LED will be blinking 6 times.

Compressor will be turned off immediately. (not enable to restart by remote controller)

7

Running current is overloaded. (CT2)

The operating LED will be blinking 7 times.

Compressor will be turned off immediately. (not enable to restart by remote controller)

8

Indoor fan lock error (BLDC fan model)

The operating LED will be blinking 8 times.

The operation is off(enable to restart by remote controller).

9

Outdoor fan lock error (BLDC fan model)

The operating LED will be blinking 9 times.

The operation is off(enable to restart by remote controller).

D-PIPE TH is short or open.

The operating LED will be blinking 10 times.

Compressor will be turned off immediately. (restart compressor when D-PIPE TH. is recovred)

1

2

6

10

❈ Error code ➅, ➆ can’t be operated unless the power cord is removed.

2. The malfunction indicator of outdoor (see the LED01M on the outdoor PCB ass’y) Error Code

The cause of malfunction

Malfunction indicator

Indoor TH. is short or open.

The LED01M will be blinking twice.

Keep operating state.

4

Temp. of Heat sink is over 95°C, or Heat sink TH. is shortor open.

The LED01M will be blinking 4 times.

Restart compressor when heat sink Temp. is 85°C below.

5

Comunication error (serial comunication).

The LED01M will be blinking 5 times.

The operation is off(enable to restart by remote controller).

DC peak error.

The LED01M will be blinking 6 times.

Compressor will be turned off immediately. (not enable to restart by remote controller)

7

Running current is overloaded.

The LED01M will be blinking 7 times.

Compressor will be turned off immediately. (not enable to restart by remote controller)

9

Outdoor fan lock error (BLDC fan model)

The LED01M will be blinking 9 times.

The operation is off(enable to restart by remote controller).

D-PIPE TH is short or open.

The LED01M will be blinking 10 times.

Compressor will be turned off immediately. (restart compressor when D-PIPE TH. is recovered)

2

6

10

The operating state

102

LG

RAC ART COOL Deluxe Inverter C18AW* C24AW*

103

RAC: ART COOL Inverter C18AW* & C24AW*

Troubleshooting Guide

Self-diagnosis function 1. The malfunction indicator of indoor (see the operating LED of the INDOOR) Error Code

The cause of malfunction

Malfunction indicator

The operating state

Indoor TH. is short or open.

The display show "C1"

Keep operating state.

Outdoor TH. is short or open.

The display show "C2"

Keep operating state.

4

Temp. of Heat sink is over 95°C. /Heat sink TH. is short or open.

The display show "C4"

Restart compressor when Heat sink Temp is 85°C below.

5

Comunication error (serial comunication).

The display show "C5"

The operation is off(enable to restart by remote controller).

DC peak error.

The display show "C6"

Compressor will be turned off immediately. (not enable to restart by remote controller)

7

Running current is overloaded. (CT2)

The display show "C7"

Compressor will be turned off immediately. (not enable to restart by remote controller)

8

Indoor fan lock error (BLDC fan model)

The display show "C8"

The operation is off(enable to restart by remote controller).

9

Outdoor fan lock error (BLDC fan model)

The display show "C9"

The operation is off(enable to restart by remote controller).

D-PIPE TH is short or open.

The display show "CA"

Compressor will be turned off immediately. (restart compressor when D-PIPE TH. is recovred)

1

2

6

10

❈ Error code ➅, ➆ can’t be operated unless the power cord is removed.

2. The malfunction indicator of outdoor (see the LED01M on the outdoor PCB ass’y) Error Code

The cause of malfunction

Malfunction indicator

Indoor TH. is short or open.

The LED01M will be blinking twice.

Keep operating state.

4

Temp. of Heat sink is over 95°C, or Heat sink TH. is shortor open.

The LED01M will be blinking 4 times.

Restart compressor when heat sink Temp. is 85°C below.

5

Comunication error (serial comunication).

The LED01M will be blinking 5 times.

The operation is off(enable to restart by remote controller).

DC peak error.

The LED01M will be blinking 6 times.

Compressor will be turned off immediately. (not enable to restart by remote controller)

7

Running current is overloaded.

The LED01M will be blinking 7 times.

Compressor will be turned off immediately. (not enable to restart by remote controller)

9

Outdoor fan lock error (BLDC fan model)

The LED01M will be blinking 9 times.

The operation is off(enable to restart by remote controller).

D-PIPE TH is short or open.

The LED01M will be blinking 10 times.

Compressor will be turned off immediately. (restart compressor when D-PIPE TH. is recovered)

2

6

10

The operating state

104

RAC ART COOL Panel Inverter A09AW A12AW A09AW1 A12AW1

105

RAC: ART COOL PANEL Inverter A..AW & A..AW1

Troubleshooting Guide

Self diagnosis Function Error Code 1 time

1

Cause of Error

Error Indicator 1time

3 sec

1time

3 sec

1time

3 sec

1time

3 sec 2 times

2 times

2 times

2 times

3 sec

3 sec

3 sec

2

4

5

4 times

4 times

3 sec

3 sec

5times

5times

3 sec

3 sec

6times

6

6times

3 sec

3 sec 8times

8

8times

3 sec

9times

9

9times

3 sec

10 times 10 times

10

3 sec

1time

12

2times

1time

3 sec

1time

13

1time

4 times 3 sec

• Outdoor Temp. sensor error - Sensor open or short

O

O

ON

• Heat Sink sensor error - Sensor open or short - Heat Sink temp is over 95 °…

O

O

ON

O

O

OFF

• DC Peak error

O

O

SHUT DOWN

• Over current error (CT2)

O

O

SHUT DOWN

• Indoor fan lock error (BLDC fan model only)

O

• Outdoor fan lock error (BLDC fan model only)

O

O

OFF

• D-Pipe TH. is short or open.

O

O

ON

• Communication error

ON

1time

OFF

O

ON

3 times

• PSC Error - PSC Fault Error

O

ON

4 times

• Comp Phase Current Error (180 Driver Comp Control Model Only)

O

ON

3 sec

3 times

O

• EEPROM Error - EEPROM Check sum Error

3 sec

1time

14

2times

Indoor Operation

• Indoor Temp. sensor error - Sensor open or short

7times

7times

7

Display Indoor Outdoor

106

RAC: ART COOL PANEL Inverter A..AW & A..AW1

Troubleshooting Guide

Troubleshooting for error code Error code

Description

1

Indoor TH. is short or open

Check flow

Cause of error • Indoor TH. (sensor) is short or open • Indoor TH. (sensor) is not connected to the indoor pcb assembly • Damage or defect on the sensing circuit of indoor pcb assembly. (R01H, R02H, R03H, R04H, C01H, C02H)

YES

Indoor TH. is connected to Indoor pcb assembly ?

YES Sensing circuit of indoor pcb is right ?

Indoor TH. is right ?

No

No Check Indoor TH. - Measure resistance of TH. (air : about 10k . at 25 °C, pipe : about 5k . at 25 °C)

- Connect to CN-TH1 in indoor pcb assembly

Error code

Description

2

Outdoor TH. is short or open

Check flow Outdoor TH. is connected to outdoor pcb assembly ? No

- Connect to CN-TH1 in outdoor pcb assembly

No

- Check soldering state of R01H ~ R04H, C01H, C02H

Cause of error • Outdoor TH. (sensor) is short or open • Outdoor TH. (sensor) is not connected to the outdoor pcb assembly • Damage or defect on the sensing circuit of outdoor pcb assembly. (R03H~R06H, C02H, C03H)

YES

YES Outdoor TH. is right ? No Check outdoor TH. - Measure resistance of TH. (air : about 10k . at 25 °C, pipe : about 5k . at 25 °C)

Sensing circuit of outdoor pcb is right ? No

- Check soldering state of R03H ~ R06H, C02H, C03H

107

Troubleshooting Guide

RAC: ART COOL PANEL Inverter A..AW & A..AW1

• 9K / 12K Description

Error code

4

Cause of error

Heat-sink Temp. is over 95°C Heat-sink TH. is open or short

Check flow Heat-sink TH is connected to outdoor PCB assembly? No

- Connect to CN-TH2 in outdoor PCB assembly

• Heat-sink TH. is damaged(short or open). • Heat-sink Temp. is over 95°C • Damage or defect on the sensing circuit of outdoor pcb assembly. (R01H, R02H, C01H)

YES

YES Heat-sink TH. in INV-IC is Right ? No

Check heat-sink TH. - Measure resistance of TH. (about 10k . at 25 °C)

Sensing circuit of outdoor pcb is right ? No

- Check soldering state of R01H, R02H, C01H

108

RAC: ART COOL PANEL Inverter A..AW & A..AW1 Description

Error code

5

Cause of error • Wrong or missing wiring between indoor and outdoor unit cable • Defect of communication components in indoor pcb assembly • Defect of communication components in outdoor pcb assembly • Defect of power supply components in outdoor pcb assembly • No ground connection in air conditioner unit (affected by noise in power source)

Communication Error

Check flow

YES

No Indoor 1(BR) 2(BL) 3(GN/YL) 4(RD)

YES Is the voltage of T/Block , in outdoor about AC 220/240V ?

Wiring connection Is right ?

Is the voltage of GND & DC5V in Outdoor pcb about DC 5V ?

No Outdoor 1(BR) 2(BL) 3(GN/YL) 4(RD)

Troubleshooting Guide

No

Check power connector Is not connected to the T/Block in indoor unit.

YES

Check FUSE, NF01/02J, PTC, Power Module, BD-01S in Outdoor pcb assembly

YES Communication circuit of indoor & outdoor pcb Is right ? No

Check IC01K, IC02K,D01K~D03K, ZD01K~ZD03K, R01K~R10K, C01K~C04K

Ground connection is installed ? (power outlet or outdoor chassis) No

Earth port

Install ground connection from outdoor unit. (In case power outlet has no earth port)

109

RAC: ART COOL PANEL Inverter A..AW & A..AW1

Troubleshooting Guide Error code

Cause of error

Description

6

DC Peak Error

Check flow

• Supplied power is not normal • Comp Connector (CN-U,V,W) is disconnected or inserted to wrong position • Compressor is damaged (coil short) ➔ replace compressor • Too much Refrigerant • Defect in outdoor pcb assembly ➔ replace pcb assembly

YES

Supplied voltage to Outdoor pcb is about AC 220/240V ?

YES Is connector (CN-U,V,W) connected to compressor and inserted to pcb in right position ?

No

Refrigerant pressure is right ?

No

No

Check CN-U,V,W connector (U : RD, V : BL, W : YL)

Check power source

YES

Check refrigerant pressure and adjust.

YES Inverter components in outdoor right ?

Is the compressor right ? No

No

Check resistance Between U-V, V-W, U-W port. → Short / Open circuit (Comp.motor coil error) → normal : 1 ~2 . Between U,V,W and Body °Ê normal : over10M .

* 9 K/12K Model Check Short of SPM3 pins (GND - P, U, V, W pin) Direction of D01Z~D03Z, C08Z,10Z,12Z,16Z Assembling state of R01P ~ R21P & IC01P Assembling state of screw between INV-IC & Heat-sink DC 15V output of Power module.

U . V

W

pcb assembly are

* 18 K Model Check Short of SPM2 pins (GND – P, U, V, W pin) Direction of D01Z~D03Z, C08Z,10Z,12Z,16Z Assembling state of R01P ~ R21P & IC01P Assembling state of screw between INV-IC & Heat-sink DC 15V output of Power module.

110

RAC: ART COOL PANEL Inverter A..AW & A..AW1 Error code

Description

7

Over current Error (CT2)

Check flow

Cause of error • Supplied power is not normal • Indoor/outdoor fan is locked • Too much refrigerant • Defect in current sensing circuit in outdoor pcb assembly

YES

YES

Supplied voltage to Outdoor pcb is about AC 220/240V ?

Does indoor / outdoor fan work normally ?

No

No Check indoor / outdoor fan and adjust.

Check power source

Troubleshooting Guide

Refrigerant pressure is right ? No Check refrigerant pressure and adjust.

YES Current sensing circuit is right ? No Check current sensing circuit. - check CT is damaged in outdoor pcb (output wire is disconnected to pin or not) - BD01N is inserted in right position (refer marking on pcb and component) - Spec of R01N (1k. ), R02N (1.65k. ) is correct - Direction of diode (D01N, D02N) is right

111

RAC: ART COOL PANEL Inverter A..AW & A..AW1

Troubleshooting Guide Error code

Description

8

Indoor fan is locked (BLDC fan model only)

Check flow

Cause of error • Indoor fan is locked or separated • Fan connector is not connected to indoor pcb assembly • Defective in DC-fan driving circuit

YES

Indoor fan is rotating ? (1)

YES Indoor fan is rotating ? (2)

No

DC–fan driving circuit is right ?

No

Check indoor unit - remove obstacles in indoor unit - fan assembled correctly.

Description

9

Outdoor fan is locked (BLDC fan model only)

Outdoor fan is rotating ? (1) No Check outdoor unit - remove obstacles in outdoor unit

Check DC Fan Driving circuit (Soldering state & Direction) - R01F~R09F, C01F~C03F, IC01F~IC03F, Q01F~Q02F, ZD01F

Check soldering state of CN-Motor1 & assembling state of DC Fan connector

Error code

Check flow

No

Cause of error • Outdoor fan is locked by an obstacle (ex : branch of tree, bar…etc) • Fan connector is not connected to outdoor pcb assembly • Defective in DC-fan driving circuit

YES

YES Outdoor fan is rotating ? (2) No Check connector is not connected to outdoor pcb assembly (CN-FAN2)

DC–fan driving circuit is right ? No Check DC Fan driving circuit (Soldering state & Direction) - R01F~R05F, C01F~C03F, Q01F~Q04F, ZD01F

112

RAC: ART COOL PANEL Inverter A..AW & A..AW1 Error code

10

Description

Cause of error

D-Pipe TH. is short or open

Check flow D_PIPE TH. is connected to Outdoor pcb assembly ? No

Connect to CN-D_PIPE in outdoor pcb assembly

Troubleshooting Guide

• D_pipe TH. is short or open • D_pipe TH. is not connected to the outdoor pcb assembly • Damage or defect on the sensing circuit of outdoor pcb assembly

YES

YES D_PIPE TH. is right ? No

Check D_PIPE TH. - Measure resistance of TH. (about 200k. at 25°C.)

Sensing circuit of outdoor pcb is right ? No

- Check soldering state of R07H, R08H, C04H

113