Error Code 4E
Freezer defrost sensor has an open or short circuit
Moderate
Address soon - your appliance may not work properly
Also displayed as: 4E
What This Means
Defrost sensor connector at CN30 unseated; Open circuit or broken wire to defrost thermistor; Short circuit in defrost thermistor
What actually causes this:
The sensor that tells the fridge when to stop defrosting the freezer coils has lost its connection or failed.
First Thing to Check
Run a forced defrost cycle from test mode and listen for the defrost heater to energize; if no heat, the sensor circuit is suspect.
Parts Involved
How to Fix
- 1
Measure voltage between Main PCB CN30 pin 1 and pin 4; should be within 4.5V–1.0V
- 2
Measure resistance between CN30 pins 4 and 7 and compare to temperature table
- 3
Inspect connector and wire routing behind freezer evaporator cover
This Error Applies To
Samsung RF23 Series Refrigerators (2023) (2023–present)
Related Error Codes
Fridge compartment temperature sensor is faulty or disconnected
Fridge defrost sensor is open or shorted
Freezer temperature sensor has failed or lost connection
Ambient temperature sensor has failed or is disconnected
Freezer fan motor stopped or lost feedback signal
Cool Select Room fan has stopped or lost feedback
Internal board communication chip has failed
Cool Select Room temperature sensor is disconnected or failed