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FAULT CODE TROUBLESHOOTING GUIDE
Code Service
Icon
State
Description and Action
Verify wiring and defrost heater. Check defrost
heater ohms. Replace defrost heater if
necessary.
30 8 00
Ice accessories open circuit.
Check wiring for fill tube heater and mullion
chute heater.
30 8 05
No signal from ice maker for fill.
Check wiring and power to the ice maker.
30 8 10
Ice maker open circuit.
Check power and wiring to ice maker.
30 8 30
Flash
with
Chime
Water valves not opened, but water flow
observed by the flow meter.
Confirm water pressure is above 34.5 kPa.
Inform customer if not.
30 9 01
Bulk ice switch stuck closed. Bulk ice switch
pressed or closed for more than five seconds
with door closed.
Inspect bulk ice switch and wiring.
30 9 10
Dispenser auger open.
Check wiring and power to auger motor.
30 9 80 Check communications cable to dispenser.
30 9 86
Dispenser chute motor timed out. Chute motor
failed to reach open or closed position.
Verify motor and chute are moving freely and
not jammed or blocked. Replace dispenser
assembly if necessary.
30 U 00
Water valve open.
Check wiring and power to water valve. Check
solenoid ohms.
30 U 10
Dispenser water valve open.
Check wiring and power to water valve. Check
solenoid ohms.
30 U 20
Water check valve open circuit.
Solenoid is open.
35 3 00 This code is inactive. Please ignore.
35 3 35 This code is inactive. Please ignore.
35 A 36
Check air filter fan is connected properly and
functioning.
FAULT CODE TROUBLESHOOTING GUIDE
Code Service
Icon
State
Description and Action
35 A 37
Check air filter fan is connected and no shorts
are evident.
35 F 33
Check freezer evaporator fan for obstructions
that cause inability to achieve full speed.
35 F 34
Verify freezer evaporator fan not shorted. If the
fan is shorted, it runs faster than the speed
setting.
35 r 33
Check refrigerator evaporator fan for
obstructions that cause inability to achieve full
speed.
35 r 34
Verify refrigerator evaporator fan not shorted. If
the fan is shorted, it runs faster than the speed
setting.
40 1 38
Refrigerator stepper valve communication fault.
Replace control board.
40 1 40 On
Excessive refrigerator compressor run time.
Verify performance of unit and check for door
leaks, door ajar, icing of evaporator, and proper
charge in system.
40 2 38
Freezer stepper valve communication fault.
Replace control board.
40 2 40 On
Excessive freezer compressor run time.
Verify performance of unit and check for door
leaks, door ajar, icing of evaporator, and proper
charge in system.
40 8 40
Ice maker ran for maximum fill time without
achieving necessary volume.
Check for water system blockages, kinked
water lines, and proper water pressure.
40 9 40
Dispenser active for maximum fill time.
Verify no stuck keys or flooding.
40 b 38
Baffle stepper communication fault.
Replace control board.
44 0 00
Glass door heater open circuit.
Check wiring and power to heater.
44 0 01
Glass door heater short circuit.
Check wiring and power to heater.
44 9 42 One-watt glass well heater not detected.
ICBBI-42UFDID
Troubleshooting
Built-In Fault Code Troubleshooting Guide (continued)
service.subzero.com
7041397 REVA 12/2017
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