Error Code 4
Freezer defrost sensor is not responding or is broken
Critical
Stop using immediately - risk of damage or safety issue
Also displayed as: F-Def Sensor Error
What This Means
Defrost sensor disconnected or damaged; Wire cut or short circuit; Sensor mounted incorrectly on evaporator; Temperature reading anomaly
What actually causes this:
Defrost cycle sensor damage or connection failure
First Thing to Check
Check connector pins at DC BLU1 for corrosion or loose fit
Parts Involved
How to Fix
- 1
Check voltage between Case Connector DC BLU1 #14 and #15
- 2
Expected voltage should be within 4.5V to 1.0V
- 3
Verify sensor is properly mounted on freezer evaporator
- 4
Test sensor response during defrost cycle
This Error Applies To
Samsung BRF425200A Series Refrigerators (2017) (2017–present)
Related Error Codes
Cocktail ice maker sensor is not responding
Cocktail ice maker is not producing ice
Pantry compartment temperature sensor is not working
Standard ice maker position or operation sensor is not responding
FlexZone compartment temperature sensor is broken or disconnected
Rear cabinet heater element is broken or disconnected
Ice maker water line heater is broken or disconnected
FlexZone compartment is not maintaining proper temperature