Error Code 4
Freezer defrost sensor has failed or lost connection
Moderate
Address soon - your appliance may not work properly
Also displayed as: LED 4 blink
What This Means
Sensor housing slipped out of connector; Open or shorted wire; Sensor reads temperature out of valid range (+50°C to -50°C)
What actually causes this:
The sensor clipped to the freezer evaporator coil has come loose or its wire has been damaged, so the board cannot tell when the defroster is done.
First Thing to Check
Verify the defrost sensor is clipped properly to the evaporator coil and its connector at CN2 pins 1 and 6 is seated.
Parts Involved
How to Fix
- 1
Access self-diagnostic mode
- 2
Measure voltage at Case Connector CN2 pin #1 to pin #6 — should be between 1.0V and 4.5V
- 3
Inspect sensor placement on freezer evaporator
- 4
Check wiring from sensor to CN2
This Error Applies To
Samsung RS27FDBTNS Series Refrigerators (2016) (2016–present)
Related Error Codes
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Main board and inverter compressor board have lost communication
Interior humidity sensor has failed or disconnected