Error Code ⑤
The freezer defrost sensor isn't reading temperature correctly
Critical
Stop using immediately - risk of damage or safety issue
Also displayed as: LED blinks in self-diagnostic checklist position 5
What This Means
Defrost thermistor (502AT) disconnected at freezer evaporator; Wire harness damaged between sensor and Main PBA; Thermistor defective (open circuit or short); Main PBA defect
What actually causes this:
The defrost sensor wire came loose or the sensor failed
First Thing to Check
Check that the defrost cycle completes normally — ice should not accumulate excessively on freezer coils
Parts Involved
How to Fix
- 1
1. Measure voltage at MAIN PCB CN20 between pins 6 and 8 — must be 4.5V to 1.0V
- 2
2. Check connector at defrost sensor in freezer evaporator compartment
- 3
3. Disconnect CN20 and measure thermistor resistance directly (power off)
- 4
4. At 77°F (25°C), should read 5.0 kΩ
- 5
5. If resistance is normal, issue is on Main PBA
This Error Applies To
Samsung RF23R6 Series Refrigerators (2010) (2010–present)
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