Fisher & Paykel RX256DT4X1 FP Service Manual page 72

321023
Symptom Possible Cause
No LED lit, Water Failed PCB.
dispenser
operates, auger
motor operates
only in Ice Mode
and ice chute door
does not open or
remains open.
No LED lit, Water Failed PCB.
dispenser
operates, auger
motor operates
only in Ice Mode
and dispenser light
is on continuously.
Neither Water, Failed PCB.
Crush or Ice LED
will illuminate but
Water, Crush or Ice
Mode operates
properly when
selected.
Crush LED is Failed main
illuminated but dispenser switch
does not dispense (failed open).
crushed ice when
main dispenser
switch is pressed.
No continuity.
Failed auger motor
or PCB.
Crushed ice starts Failed main
to dispense as dispenser switch
soon as Crush (failed short).
Mode is selected
without pressing
the main dispenser
switch.
Failed PCB.
Supply pressure
Filter model
Bypass installed
Filter model
New filter installed
Fisher & Paykel specifies a minimum supply pressure of 240 kpi (35 psi) for water filter units.
Minimum pressure requirement ensures that water valves close and sufficient water volume is available
to fill icemaker. Proper fill is 140 cc. of water in 7.5 seconds. Failure of water valves to close
because of low pressure will result in fill-tube freeze-up or dripping at cavity.
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.
Disconnect power. Remove the cover of freezer
door hinge located on top of the unit and
disconnect the connectors. Check pin 10 (BU
wire) of 10-pin connector for continuity.
With PCB powered, press the Main dispenser
switch. Measure voltage on pin 10 (BU 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 less than 1 Ω
in this position and higher than 10 MΩ when
switch is open.
With PCB powered, measure voltage on pin 10
(BU wire) of 10-pin connector. Voltage should
read 0 VAC.
Seconds to dispense 10 oz. of water
35 psi 45 psi
240 kpi 310 kpi
9.0
11.0
72
55 psi
380 kpi
8.0 7.0
10.0 8.0
Repair
Replace PCB.
Replace PCB.
Replace PCB.
Replace switch.
Repair open
connection.
Replace auger
motor if voltage
reads 120VAC. If
not, replace PCB.
Replace switch.
Replace PCB.
75 psi
520 kpi
6.0
7.0