Fisher & Paykel RX256DT4X1 FP Service Manual page 71

Symptom Possible Cause
Water starts to Failed main
dispense as soon dispenser switch
as Water Mode is (failed short)
selected without
pressing the main
dispenser switch. Failed PCB
Ice LED is Failed main
illuminated but dispenser switch
does not dispense (failed open).
cubed ice when
main dispenser
switch
is pressed. No continuity.
Failed auger motor
or PCB.
Ice starts to Failed main
dispense as soon dispenser switch
as Ice Mode is (failed short).
selected without
pressing the main
dispenser switch.
Failed PCB.
Dispenser operates Failed PCB.
continuously even
when Dispenser
Lock Mode is
activated.
Auto Light Mode Failed PCB.
does not operate.
Ice or Water Failed PCB.
dispenser
mechanism runs
continuously.
Filter Status LED Failed PCB.
never changes to
red.
Auger motor Failed solenoid.
operates in Ice or
Crush Mode but ice
door chute never
opens.
Auger motor Failed PCB.
operates in Ice or
Crush Mode but ice
door chute never
closes.
Test Procedure
Disconnect power. Remove both leads from the
switch and measure resistance across switch
terminals. Resistance should read less than 1 Ω
in this position and higher than 10 MΩ when
switch is open.
With PCB powered, measure voltage on pin 7 (YL
wire) of 10-pin connector. Voltage should read 0
VAC.
Disconnect power. Remove both leads from the
switch and measure resistance across switch
terminals. Resistance should read less than 1 Ω in
this position and higher than 10 MΩ when switch
is open.
Disconnect power. Remove the cover of freezer
door hinge located on top of the unit and
disconnect the connectors. Check pin 9 (OR
wire) of 10-pin connector for continuity.
With PCB powered, press the Main dispenser
switch. Measure voltage on pin 9 (OR wire) of
10- pin connector. Voltage should read 120VAC.
Disconnect power. Remove both leads from the
switch and measure resistance across switch
terminals. Resistance should read higher than
10 MΩ when switch is open and less than 1 Ω
when switch is closed.
With PCB powered, measure voltage on pin 9
(OR wire) of 10-pin connector. Voltage should
read 0 VAC.
With PCB powered, measure voltage on pin 5
(PK wire) of 10-pin connector. Voltage should
read 0 VAC.
With PCB powered and Auto Light activated, cover the
light sensor. Measure voltage on pin 8 (BR wire) of
10-pin connector. Voltage should read 1/2 the AC
power supply (120 VAC).
With PCB powered, measure voltage on pin 5
(PK wire) of 10-pin connector. Voltage should
read 0 VAC.
Verify with the user if unit has been unplugged
for a long period. Demonstrate reset operation to
customer.
Disconnect power. Remove both leads from the
solenoid and measure the resistance across
solenoid terminals. Resistance should read
101.2 ± 10%.
Measure voltage on pin 10 (BU wire) of 10-pin
connector. Voltage should read approximately
55VDC when ice chute door is open (solenoid
energized) or 0VDC when closed (solenoid not
energized).
71
321023
Repair
Replace switch.
Replace PCB.
Replace switch.
Repair open
connection.
Replace auger
motor if voltage
reads 120VAC.
If not, replace PCB.
Replace switch.
Replace PCB.
Replace PCB.
Replace PCB.
Replace PCB.
Replace water filter
and reset Filter
Status. Replace
PCB if problem
continues.
Customer
education.
Replace solenoid.
Replace PCB.