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Samsung Refrigerators2019–present

Error Code 4

Freezer defrost sensor is not working

Critical

Stop using immediately - risk of damage or safety issue

Also displayed as: 4c

What This Means

Sensor slipped out of housing; Wire cut; Wire short circuit; Sensor reading outside -50°C to +50°C range

What actually causes this:

Defrost sensor on evaporator is frozen or disconnected

First Thing to Check

Verify the defrost sensor connector is seated properly

Parts Involved

F-Def SensorDC BLU1 Connector

How to Fix

  1. 1

    Measure voltage between Case Connector DC BLU1 #14 and #15

  2. 2

    Voltage should be between 4.5V and 1.0V

  3. 3

    Check defrost sensor housing

  4. 4

    Verify sensor is detecting evaporator temperature

This Error Applies To

Samsung BRF425200AP Series Refrigerators (2019) (2019–present)

Service manual exact match: BRF425200AP/AA

Related Error Codes

9

FlexZone compartment sensor failed

13

Outside humidity sensor is broken

7

Pantry compartment temperature sensor failed

2

Fridge temperature sensor is broken or disconnected

5

Fridge defrost sensor is not working

1

Freezer temperature sensor is broken or disconnected

6

Outside temperature sensor is broken

11

FlexZone defrost sensor is not working

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