599090 Diagnostics 920 DW.pdf

SOFT TOUCH DISHWASHER MODELS DW820 DW920

599090 Fisher & Paykel Appliances © 2003

July 2003

GENERAL SPECIFICATIONS Dimensions

Width 590mm Depth 555mm Height 825 - 875mm Door Open 590mm

Electrical

230/240V AC 50Hz 8 amp max.

Heating Element

Calrod type 230/240V AC 50Hz 230V AC - 1500 watt 240V AC - 1625 watt DC Resistance reading 35 ohms

Combined Rinse Aid / Detergent Dispenser Rinse Aid ELTEK 230-240V 50Hz Rinse Aid Volume 130cc Dosage 1 - 6cc Detergent Intermittent Duty Coil Detergent Capacity Maximum Capacity 40 grams

Temperature Sensor (PTC)

2000 ohms at 25°C (room temperature)

Electronic PCB Board Assy - 818 & 918 Manufactured by Fisher & Paykel Electronics

Water Inlet Valve

ELBI 230/240V AC 50Hz Coil Electrically actuated diaphragm type with built-in filter supplied with 5 litres/min flow regulator. DC resistance readings: 3.6 – 4.2 K ohms 2

Drain Pump

HANNING DPS 25-019 Pump 20 litres/min at Head = 1m DC resistance reading: 135 ohms

Microswitch

Single Pole double throw 250V AC 50Hz 10 amp

Flood Microswitch EMZ 38.0060.1 250V AC 50 Hz 2 amp

Overheat Thermostat 230/240V AC 50Hz 25 amp Overheat Thermostat Open 85°C Close 50°C

Wash Pump

HANNING PSK12-110 230/240 V AC 50Hz 220 watt Pump 95 litres/min Head 4m DC Resistance Reading between motor terminals · 1 & 2 = 38 ohms + 10% · 1 & 5 = 88 ohms + 10% · 2 & 5 = 125 ohms + 10%

Capacitor

4uF, 400v AC

Finish

Tub, internal plumbing, bottom spray arm, inner door - stainless steel. Baskets - nylon coated wire rod. Cabinet, outer door, front panels - pre-painted white hi-bake acrylic over zinccoated steel. Top spray arm – plastic.

3

FAULT DIAGNOSTIC CHART FOR DW920 AND DW820* (* DW820 has no L.C.D. display. The illuminated L.E.D.s will indicate the diagnostics and fault finding codes.) The fault diagnostics consists of 4 stages of diagnostics as follows: 1. Display & LED Test, Current and Previous Fault History and Controller Software Version. 2. Hardware Outputs (HO). 3. Permanent Cycle and Cycle Count 4. Fast Test Cycle and Dry Test Cycle.

To Enter Diagnostics

Power on at wall socket. No LEDs or displays showing. · Press and hold the ECO SAVE, and then press POWER for 4 seconds. · To move between levels, press WASH. · To move between modes within a level, press START/PAUSE. · To select an option, press ECO. · To exit the diagnostic mode, press POWER. 1st

0

MODE

1 2 3 4 5 6 7 8

LEVEL Level

Level All L.E.D.s on and HO L.C.D. showing 88 Current Fault Door Switch Previous Fault Software Version

2nd

Flood Switch Inlet Valve Element Wash Pump Dispenser Drain Pump Temperature

4

3rd Level Permanent Cycle Cycle Count

4th Level Fast Cycle Dry Cycle

On first entering diagnostics, all L.E.D.s will be illuminated and the L.C.D. will display “88”. · Press START/PAUSE. The current fault will be displayed (refer to table on page 5). · Press START/PAUSE. The previous fault will be displayed. · Press START/PAUSE. The controller software version will be displayed. Press WASH to enter the second level of diagnostics. · Press START/PAUSE. This enters the door switch test. “8” will be displayed in the L.C.D. Activating the door switch will show “0” in the L.C.D. and the ECO L.E.D. will illuminate. · Press START/PAUSE. This enters the flood switch test. “8” will be displayed in the L.C.D. Activating the flood switch will show “F” in the L.C.D. and the HEAVY L.E.D. will illuminate. · Press START/PAUSE. This enters the inlet valve test. “C” will be displayed in the L.C.D. and the NORMAL L.E.D. will illuminate. · Press ECO to activate and deactivate the inlet valve. · Press START/PAUSE. This enters the element test. “E” will be displayed in the L.C.D. and the FAST L.E.D. will illuminate. · Press ECO to activate and deactivate the element. · Press START/PAUSE. This enters the wash pump test. “P1” will be displayed in the L.C.D. and the HEAVY and ECO L.E.D.s will illuminate. · Press ECO to activate and deactivate the wash pump. · Press START/PAUSE. This enters the dispenser test. “dl” will be displayed in the L.C.D. and the NORMAL and ECO L.E.D.s will illuminate. · Press ECO to activate and deactivate the dispenser. · Press START/PAUSE. This enters the drain pump test. “P2” will be displayed in the L.C.D. and the FAST and ECO L.E.D.s will illuminate. · Press ECO to activate and deactivate the drain pump. · Press START/PAUSE. This enters the temperature sensor test. Refer to the chart on page 3 for details. Press WASH to enter the third level of diagnostics. · This enters the permanent cycle. “PC” will be displayed in the L.C.D. and the HEAVY and FAST L.E.D.s will illuminate. · Press ECO to display the last used cycle. Select the cycle required for the permanent cycle. Press START/PAUSE to start the permanent cycle. The dishwasher will complete the cycle, then start it over again. 5

This will continue until POWER is pressed to exit diagnostics. · Pressing START/PAUSE at any time will pause the cycle, and the number of cycles the controller has completed in its life will be displayed. Refer to cycle count chart on page 4. Press WASH to enter the fourth level of diagnostics. · This enters the fast test cycle. “FC” will be displayed in the L.C.D. and the RINSE and ECO L.E.D.s will illuminate. · Press ECO to activatethe fast test cycle. Press POWER to stop the fast test wash. During the cycle, pressing ECO will display the temperature (DW920 only). · Press START/PAUSE. This enters the dry test cycle. “dC” will be displayed in the L.C.D. and the NORMAL and HEAVY L.E.D.s will illuminate. · Press ECO to start the test dry. Press POWER to stop the test dry cycle and exit diagnostics. Press WASH to return to the first level of diagnostics.

Temperature Display

During the operation of a normal cycle (when not in diagnostics), the temperature can be displayed on the DW920. To turn on temperature display: · Activate KEYLOCK. · Press POWER for 4 seconds. · Deactivate KEYLOCK. The temperature read by the temperature sensor is now displayed on the L.C.D. while normal operations are continued. To turn off temperature display: · Activate KEYLOCK. · Press POWER for 4 seconds. · Activate KEYLOCK. · Press POWER for 4 seconds.

Temperature Sensor L.E.D. Chart

In diagnostics, the temperature is displayed in a binary code, and also on the display (DW920 only). Using the binary codes, the temperature is found by adding together the value of the L.E.D.s that are illuminated. Note: The temperature display only increases in 4 degree steps, i.e. 23oC would read as 20oC, and the display would not increase until 24oC was reached. 6

L.E.D. Code: L.E.D Eco Rinse Fast Normal Heavy Example:

Value 4oC 8oC 16oC 32oC 64oC

If the Eco and Fast L.E.D.s were illuminated, the temperature would be 20oC. If the Eco and Normal L.E.D.s were illuminated, the temperature would be 36oC.

Cycle Count Chart

This is a hexadecimal system used to calculate the number of cycles the electronic controller has completed. To retrieve the cycle count data, enter the third level of diagnostics as described on page 2 and 3. The DW820 only displays the cycle counts in segments of 256 cycles by using the L.E.D.s, while the DW920 displays exact cycle counts by using both the L.E.D.s and the L.C.D. as shown on the following chart.

7

For example, on a DW820, if the ECO and RINSE L.E.D.s are lit, 256 + 512 = 768. The cycle count is between 768 and 1024 cycles. Number of cycles (LED Display) Number of cycles (LCD Display DW920 only) Eco

256

Rinse

512

TENS COLUMN SYMBOL

Fast

1024

Normal

TENS COLUMN

ONES COLUMN SYMBOL

ONES COLUMN

16 X 0 = 0

0

2048

16 X 1 = 16

1

Heavy

4096

16 X 2 = 32

2

Keylock

8192

16 X 3 = 48

3

16 X 4 = 64

4

16 X 5 = 80

5

16 X 6 = 96

6

16 X 7 = 112

7

16 X 8 = 128

8

16 X 9 = 144

9

16 X 10 = 160

10

2048

16 X 11 = 176

11

512

16 X 12 = 192

12

64

16 X 13 = 208

13

11

16 X 14 = 224

14

2635

16 X 15 = 240

15

Example (DW920) Normal LED Rinse LED

TOTAL

8

FAULT CODES FOR DW920/DW820 DISHWASHER Code DW920 Only U1

F1

LED Display DW920/ DW820 Rinse Only

Fast Wash

Description

Possible Causes

Fill Fault: The machine fills for 1 minute, and if ventilation is not seen in this time, it washes for 1 minute. If ventilation is still not seen, it drains and repeats. If at the end of this period ventilation is still not seen, the machine will flash “U1” and beep until the POWER button is pressed. Flood Fault: The flood switch has been activated by water lifting the float in the base pan and the machine will flash “F1” and beep until the power is switched off at the wall.

· Too much foam in the machine. · Tap for inlet valve is not turned on, or low water pressure. · The drain system is not working or not fast enough. There could be a blockage or a fault in the drain pump. · The wash pump is not turning on (check in diagnostics). · The wash pump is faulty.

9

· Flood has occurred or switch is faulty. · The polystyrene float may be jammed up. · Possible U1 (foaming) · Open circuit in wire to flood switch.

Code DW920 Only F3

F4

LED Display DW920/ DW820 Heavy Wash

Description

Over Temperature Fault: The temperature sensor reads a temperature greater than 90°C three times at 10 second intervals and the machine will flash “F3” and beep until the power is switched off at the wall. Eco Save No Temperature Rise Fault: The dishwasher allows 50 minutes after the timer has paused at the end of the allocated heating time. If it has still not reached the sub-cycle temperature, it will flash “F4” and beep until the power is switched off at the wall.

10

Possible Causes · The incoming water is too hot. · The machine has become too hot. · The electronic controller is faulty. · Temperature sensor or circuit is faulty.

· · · · ·

Element is not connected. Overheat cutout has tripped. Element is faulty. Electronic controller is faulty. Temperature sensor is not hard up against the inner door. · Temperature sensor circuit has shorted.

U1

Rinse Aid leaking or spilt

LED displayed, Fill System Problem.

Locate leak

Too much egg or protein in wash

Step 1

Run on FC until ventilation occurs

Clean or neutralise tub

Foaming Too much detergent

Water valve set up not correct

Not OK

OK

Change set up in software to suit water supply

Step 3 Check water inlet, are taps turned on?

Yes

No

Go into diagnostics & check water valves

Check that flow rate is more than 2.5l/min

OK

Not OK

OK Not OK

Check filters & water supply

Not OK OK

Check drain hose for blockage or kink OK

Not OK Check power to drain pump

OK

OK Check impellor

Test resistance of drain pump

Replace valve

Check edge connectors, wiring & flood switch wiring

Not OK

Replace electronic controller

OK

Repair wiring connections

Replace drain pump Not OK

Step 5

Wash Pump

Go into diagnostics & check wash pump

Not OK

Step 6

Load sensing

Replace electronic controller

Not OK

Not OK Check edge connectors & wiring

Check mechanics of valve

Not OK

Turn taps on

Go into diagnostics & check drain pump

OK

Check coil

Check power to valve

Step 4

Drain Pump

Go to Step 4 (Drain Pump)

OK

Step 2

OK Check connectors & continuity of load sensing wire

OK

Replace electronic controller

11

Check power to wash pump

Check labyrinth plate

OK

OK

Test resistance of pump

Check impellor for blockage or slipping

F1 LED displayed, Fast Wash.

Water has activated flood switch True

False

Suck out or drain water from basepan, then locate leak

Has the switch or polystyrene flood block been mislocated? Yes

Was leak from overfill drain?

No

Look for leak from sump hoses and pumps

Was machine tilted? Yes

Yes

Relocate block

Check the fill level High

Check the drain pump and water valve (5 l/min)

OK Check spray arms for splits and correct way up

Rinse base out with clean water to neutralise caustic effect of wash powder

12

No Check switch and edge connector connections

Replace electronic controller

LED displayed, Heavy W h Is the incoming water greater than 90°C? Yes

No

Turn down water temperature or fit hot and safe valve.

Is the element on all the time?

Yes

Check wiring OK Replace electronic controller

13

No Replace electronic controller

F4 LED displayed, Eco Save. Run element in diagnostics and display temperature by pressing Fast Wash

Does element heat?

Yes Does the temperature display increase?

Yes

No

Check the element resistance

No

Not OK

Change element

OK Is the sensor located correctly against the tub. The temperature has to increase more than 2°C/4min period.

Check over temp thermostat

Is the sensor located correctly against the tub?

No Check wiring

Does 78°C show in the display constantly?

OK Change electronic controller

Does 35°C show in the display constantly? Yes

OK Change electronic controller

Locate sensor to correct position

No

Check wiring and sensor edge connections for open circuit

OK

Change over temp thermostat

OK Yes

Yes

Not OK

Check wiring and sensor edge connections for short circuit

Not OK

14

Change sensor

Not OK

Repair wiring

WIRING DIAGRAM SOFT-TOUCH MODEL DW820 – DW920

15