How do I fix error code 4 on a Samsung refrigerators?

1. undefined: Check voltage between Main PCB CN20-6 and CN20-8 should be 4.5V~1.0V 2. undefined: Verify connector is fully inserted 3. undefined: Measure sensor resistance at defrost temperature

Samsung Refrigerators2021–present

Error Code 4

Q: What does error code 4 mean on a Samsung refrigerators?

Freezer defrost cycle sensor not responding Loose connector at CN20-6 and CN20-8; Defective freezer defrost thermistor; Bad PCB connection

Freezer defrost cycle sensor not responding

Critical

Stop using immediately - risk of damage or safety issue

Also displayed as: Error 4

What This Means

Loose connector at CN20-6 and CN20-8; Defective freezer defrost thermistor; Bad PCB connection

What actually causes this:

Sensor wire disconnected or sensor damaged

First Thing to Check

Verify defrost heater connector is properly seated

Parts Involved

Thermistor (F-DEF) 502ATMain PCB CN20

How to Fix

1
Check voltage between Main PCB CN20-6 and CN20-8 should be 4.5V~1.0V
2
Verify connector is fully inserted
3
Measure sensor resistance at defrost temperature

This Error Applies To

Samsung RF262BEAES Series Refrigerators (2021) (2021–present)

Service manual exact match: RF262BEAESGService manual exact match: RF262BEAESR

Related Error Codes

Ice maker temperature sensor not responding

Compressor fan not running

Pantry damper heater not heating

Input/output expander chip not responding

Inverter power module failure

Fridge defrost cycle sensor not responding

Humidity sensor not responding

Freezer defrost heater not working

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