Error Code 21
The freezer fan is not working
Critical
Stop using immediately - risk of damage or safety issue
Also displayed as: 21
What This Means
Fan motor connector disconnected; Fan motor defective or bearing seized; Main PCB relay or driver defect; Wiring harness damaged
What actually causes this:
The fan motor got stuck, the wire came loose, or the motor burned out
First Thing to Check
Check if you hear the freezer fan running — if silent and no cooling, the fan has likely failed
Parts Involved
How to Fix
- 1
1. Check voltage at Main PCB CN74 pins 1-4 should be between 7V to 12V
- 2
2. Verify fan motor connector is fully inserted
- 3
3. Listen for fan noise when powered on
- 4
4. Check fan blade for obstructions
- 5
5. Replace fan motor if defective
Other Error Codes for RF28M9580
The main control board can't talk to the display
The ice bucket heater is not working
The FlexZone compartment has gotten too warm
The humidity monitoring sensor is not working
The outdoor temperature sensor is not working
The FlexZone defrost sensor is failing and defrost cycles may not work
The freezer defrost sensor is failing and defrost cycles may not work
The fridge defrost sensor is failing and defrost cycles may not work