Error Code 5
Refrigerator defrost sensor has failed or disconnected
Critical
Stop using immediately - risk of damage or safety issue
Also displayed as: Error 5
What This Means
R-DEF thermistor failed; Connector CN30-3 or CN30-4 loose or disconnected; Wiring damage near refrigerator evaporator
What actually causes this:
The sensor that stops the fridge defrost cycle has failed, potentially causing excessive frost buildup or water on shelves.
First Thing to Check
Remove the refrigerator evaporator cover and inspect the defrost sensor and its connector.
Parts Involved
How to Fix
- 1
Check voltage at MAIN PCB CN30-3 to CN30-4: should be between 1.0V and 4.5V
- 2
Disconnect CN30 and measure resistance at pins 3 and 4
- 3
Check MICOM IC01 pin #3 voltage (R303 on PCB)
- 4
Compare to DATA1 temperature table
Other Error Codes for RF23M8570SR
Humidity sensor in the fridge compartment has failed
Ice bucket compartment heater has an open or short circuit
Mid drawer damper heater has an open or short circuit
Auto-fill water tank has detected an overflow
Freezer defrost sensor has failed or lost connection
Freezer temperature sensor has failed or lost connection
Ambient room temperature sensor has failed
Refrigerator compartment temperature sensor has failed or disconnected