Error Code R-SENSOR ERROR
Refrigerator compartment temperature sensor failed or disconnected
Critical
Stop using immediately - risk of damage or safety issue
Also displayed as: R LED blinks
What This Means
Bad connector contact at CN20; Open or shorted thermistor; PCB solder defect
What actually causes this:
Thermistor connector loosened from vibration or the sensor itself has drifted out of spec, causing erroneous temperature readings.
First Thing to Check
Check that the sensor connector near the fresh food evaporator cover is firmly plugged in.
Parts Involved
How to Fix
- 1
Check that MAIN PCB connector CN20 is fully seated
- 2
Measure voltage between CN20-9 (W/YEL) and CN20-11 (WHT); expected range 4.5V to 1.0V
- 3
Measure thermistor resistance at CN20-9 vs CN20-11 and compare to DATA1 table
- 4
Check IC01 MICOM pin 5 input voltage
- 5
Inspect PCB solder around R210
This Error Applies To
Samsung RF27T5 Series Refrigerators (2020) (2020–present)
Related Error Codes
Freezer temperature sensor has failed or disconnected
Freezer fan motor is not spinning or not sending a rotation signal
Freezer defrost heater is not working — ice may build up on evaporator
Condenser fan in the machine compartment is not spinning
The compressor inverter power module has detected a fault and shut down