Error Code 1
Freezer temperature sensor malfunction
Critical
Stop using immediately - risk of damage or safety issue
Also displayed as: 1C
What This Means
Sensor connector not seated properly at Main PCB CN30 pins 1 and 3; Thermistor wire harness damaged or cut; Thermistor defective (open circuit or shorted); Main PCB defective
What actually causes this:
Temperature sensor connector came loose or sensor wire is broken
First Thing to Check
Check if freezer is getting cold — if it's not cooling, this error is likely present
Parts Involved
How to Fix
- 1
1. Unplug refrigerator and inspect CN30 connector pins 1 and 3
- 2
2. Measure voltage between CN30 pins 1 and 3 — should be 4.5V to 1.0V range
- 3
3. Reconnect any loose connectors
- 4
4. Power on and check if error clears
- 5
5. If voltage out of range, disconnect sensor and measure resistance
- 6
6. If resistance abnormal, replace freezer thermistor
This Error Applies To
Samsung RF22N9781 Series Refrigerators (2018) (2018–present)
Related Error Codes
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Convertible zone defrost sensor malfunction
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