Error Code -21°C LED LAMP
Refrigerator cannot sense outside temperature properly
Critical
Stop using immediately - risk of damage or safety issue
Also displayed as: -21°C indicator LED lamp
What This Means
Poor open circuit connection; Short circuit in sensor wiring; Temperature abnormal (above +65°C or below -50°C); Sensor connector loose
What actually causes this:
Loose or corroded sensor connection prevents proper temperature monitoring
First Thing to Check
Visually inspect external sensor connector for corrosion or loose wiring
Parts Involved
How to Fix
- 1
1. Check voltage at both terminals of CN31 lead
- 2
2. Voltage should be within 4.6V~0.6V
- 3
3. Inspect for signs of moisture or corrosion on connector
- 4
4. Verify wire continuity from sensor to PCB
This Error Applies To
Samsung RB12A3006 Series Refrigerators
Related Error Codes
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Fridge section temperature cannot be properly measured
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