How do I fix error code FRIDGE-SENSOR on a Samsung refrigerators?

1. undefined: Check MAIN PCB connector CN20 is fully inserted 2. undefined: Measure voltage at CN20-'9' '11': should be between 1.0V and 4.5V 3. undefined: If voltage out of range, measure resistance at CN20-'9' ↔ '11' and compare to temperature table 4. undefined: Check soldering at R210 (IC01 MICOM #5) on PCB 5. undefined: 0Ω = short circuit; ∞Ω = open circuit

Samsung Refrigerators2022–present

Error Code FRIDGE-SENSOR

Refrigerator compartment temperature sensor is faulty or disconnected

Moderate

Address soon - your appliance may not work properly

Also displayed as: R blinks (Fridge indicator)

What This Means

Bad connector contact at MAIN PCB CN20; Open or short circuit in sensor wiring; Failed thermistor (0Ω = short, infinite Ω = open); PCB solder defect at R210

What actually causes this:

The sensor measuring fridge temperature has failed, causing the fridge to run too warm or too cold without knowing it.

First Thing to Check

Firmly reseat the connector at the back of the fridge compartment near the evaporator cover.

Parts Involved

Fridge thermistor (R-SENSOR, 502AT)MAIN PCB connector CN20Resistor R210

How to Fix

1
Check MAIN PCB connector CN20 is fully inserted
2
Measure voltage at CN20-'9' <-> '11': should be between 1.0V and 4.5V
3
If voltage out of range, measure resistance at CN20-'9' ↔ '11' and compare to temperature table
4
Check soldering at R210 (IC01 MICOM #5) on PCB
5
0Ω = short circuit; ∞Ω = open circuit

This Error Applies To

Samsung RF25C5 Series Refrigerators (2022) (2022–present)

Service manual exact match: RF25C5151SR/AAService manual exact match: RF25C5151**Service manual exact match: RF25C5551**Service manual exact match: RF25C5551SR/AA