Error Code 21C
Freezer evaporator fan has stopped or lost its feedback signal
Moderate
Address soon - your appliance may not work properly
Also displayed as: 21C
What This Means
Feedback signal line contact error; Fan motor wire separation; Defective fan motor; Door switch staying open, preventing fan operation
What actually causes this:
Usually a failed fan motor bearing — the fan stalls, then the MICOM detects no pulse feedback and logs the error
First Thing to Check
Open the freezer and listen for fan noise; if silent during normal operation, the fan motor has likely failed
Parts Involved
How to Fix
- 1
Check feedback signal between Main PCB CN20 pins 14 and 18 — should show a specific frequency pulse when fan is spinning
- 2
Verify voltage at CN20 #16 and #18 is DC 7–12V (motor running) or DC ~2V (feedback signal)
- 3
Run Forced Operation mode to observe fan behavior
- 4
Check that freezer and fridge door switches are closed (5V = open, 0V = closed)
Other Error Codes for RF23A9771SR
The power coming into the refrigerator is dangerously high
The heater that prevents condensation on the showcase door panel has an open circuit
The power coming into the refrigerator is too low for the compressor to run
The second ice supply line heater has an open circuit
Freezer temperature sensor is reading an impossible value
Fridge compartment sensor is detecting an impossible temperature
Freezer defrost sensor is reading outside its valid range
Outside ambient temperature sensor has failed or lost connection