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
This Error Applies To
Samsung RF22M9581 Series Refrigerators
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