How do I fix error code FRIDGE_DEF_SENSOR_ERROR on a Samsung refrigerators?

1. undefined: Check MAIN PCB connector CN30 is fully seated 2. undefined: Measure voltage between CN30-3 and CN30-4; normal range 4.5V~1.0V 3. undefined: Check MICOM IC01 pin 3 matches CN30-3/4 reading 4. undefined: Disconnect and measure sensor resistance against DATA1 table 5. undefined: Check solder at R303

Samsung Refrigerators2017–present

Error Code FRIDGE_DEF_SENSOR_ERROR

Q: What does error code FRIDGE_DEF_SENSOR_ERROR mean on a Samsung refrigerators?

Refrigerator compartment defrost sensor is faulty Disconnected or poorly seated connector at MAIN PCB CN30 pins 3 and 4; Open or shorted R DEF thermistor; Solder defect at R303 on PCB; Failed MICOM IC01 pin 3

Refrigerator compartment defrost sensor is faulty

Moderate

Address soon - your appliance may not work properly

Also displayed as: R LED blinks (Fridge indicator)

What This Means

Disconnected or poorly seated connector at MAIN PCB CN30 pins 3 and 4; Open or shorted R DEF thermistor; Solder defect at R303 on PCB; Failed MICOM IC01 pin 3

What actually causes this:

The defrost sensor in the fridge evaporator area has failed or its wiring is disconnected.

First Thing to Check

Reseat the connector at CN30 on the main board.

Parts Involved

Fridge defrost sensor (R DEF, thermistor 502AT)MAIN PCB connector CN30Resistor R303

How to Fix

1
Check MAIN PCB connector CN30 is fully seated
2
Measure voltage between CN30-3 and CN30-4; normal range 4.5V~1.0V
3
Check MICOM IC01 pin 3 matches CN30-3/4 reading
4
Disconnect and measure sensor resistance against DATA1 table
5
Check solder at R303

This Error Applies To

Samsung RF23M80 Series Refrigerators (2017) (2017–present)

Service manual exact match: RF23M80*0**Service manual exact match: RF23M8090SR/AAService manual exact match: RF23M8070SR/AAService manual exact match: RF23M8070SG/AAService manual exact match: RF23M8090SG/SAService manual exact match: RF23M8080SR/EE