Error Code 12C
Fridge compartment defrost sensor reading out of valid range
Critical
Stop using immediately - risk of damage or safety issue
Also displayed as: 12C
What This Means
Sensor housing separated; Incomplete connector contact; Open-circuited wire; Short-circuit
What actually causes this:
Defrost sensor dislodged from evaporator during a prior service call or the thermistor has failed.
First Thing to Check
Remove the REF evaporator cover and check that the defrost sensor is hooked to the evaporator.
Parts Involved
How to Fix
- 1
Check voltage between Main PCB CN20 pins 5 and 7; should be within 4.5V–1.0V range
- 2
Inspect defrost sensor mounting on fridge evaporator
- 3
Verify sensor is secured by sensor hook
- 4
Replace if out of range
Other Error Codes for RF23CB9900QKAA
Door showcase heater has an open or short circuit fault
Ice Bites ice maker temperature sensor reading invalid
Internal I/O expander chip on Main PCB has lost communication
Ambient air temperature sensor reading invalid
Freezer defrost sensor reading out of valid range
Freezer evaporator fan not running or not sending feedback signal
Flex Crisper compartment sensor out of valid range
Fridge evaporator fan not running or not sending feedback