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FAULT CODE TROUBLESHOOTING GUIDE
Code Service
Icon
State
Description and Action
Verify freezer compressor relay stuck closed.
Replace control board.
15 4 00 On
Defrost relay is stuck open. No power to defrost
heater.
Verify defrost relay is stuck open. Replace
control board.
15 4 01 Flash
Defrost relay is stuck closed. Power to defrost
heater at all times.
Verify defrost relay is stuck closed. Replace
control board.
15 8 00
Ice maker relay is stuck open. No power to ice
maker.
Verify ice maker relay is stuck open. Replace
control board.
15 8 01
Ice maker relay is stuck closed. Power to ice
maker at all times.
Verify ice maker relay is stuck closed. Replace
control board.
15 8 10
Ice accessories relay is stuck open. No power
to ice accessories.
Verify ice accessories relay is stuck open.
Replace control board.
15 8 11
Ice accessories relay is stuck closed. Power to
ice accessories at all times.
Verify ice accessories relay is stuck closed.
Replace control board.
15 9 00
Dispenser auger relay is stuck open. No power
to auger.
Verify dispenser auger relay is stuck open.
Replace control board.
15 9 01 On
Auger relay is stuck closed. Power to auger at
all times.
Verify auger relay is stuck closed. Replace
control board.
15 9 65
Water valve selecting relay stuck at dispenser
water position. Ice making system disabled.
Replace control board.
15 9 66
Water valve selecting relay stuck at ice maker
water position.
Replace control board.
15 L 00
Main lights relay is stuck open. Power to lights
at all times.
FAULT CODE TROUBLESHOOTING GUIDE
Code Service
Icon
State
Description and Action
Verify main lights relay is stuck open. Replace
control board.
15 L 01
Main lights relay is stuck closed. No power to
lights.
Verify main lights relay is stuck closed. Replace
control board.
15 L 55 This code is inactive. Please ignore.
15 L 56 This code is inactive. Please ignore.
15 U 00
Water valve relay is stuck open. No power to
water valve.
Verify water valve relay is stuck open. Replace
control board.
15 U 01
Flash
with
Chime
Water valve relay is stuck closed. Power to
water valve at all times.
Verify water valve relay is stuck closed. Replace
control board.
15 U 10
Water check valve relay is stuck open. No
power to water check valve.
Verify water check valve relay is stuck open.
Replace control board.
15 U 11
Water check valve relay is stuck closed. Power
to water check valve at all times.
Verify water check valve relay is stuck closed.
Replace control board.
20 2 00 On
Defrost bi-metal stuck open.
Verify the bimetal is open below -1°C. Replace
if necessary.
20 2 01 On
Defrost bi-metal stuck closed.
Verify the bi-metal is closed above 13°C.
Replace if necessary.
20 2 05
Mis-wired bi-metal. Normal temperatures during
defrost, but inappropriate response from bi-
metal.
Check wiring and bi-metal mounting.
20 2 06 On
Mis-wired bi-metal. High temperatures during
defrost, and inappropriate response from bi-
metal.
Check wiring and bi-metal mounting.
20 2 07
Defrost bi-metal error. Check bi-metal ohms.
Replace defrost heater if necessary.
20 2 50 On Defrost heater open.
ICBBI-42UFDID
Troubleshooting
Built-In Fault Code Troubleshooting Guide (continued)
service.subzero.com
7041397 REVA 12/2017
156