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Samsung Refrigerators2018–present

Error Code 5

Fridge defrost sensor malfunction

Critical

Stop using immediately - risk of damage or safety issue

Also displayed as: 5C

What This Means

Connector not properly seated at Main PCB CN30 pins 1 and 6; Wire harness cut or damaged; Defrost thermistor internal failure; Main PCB defective

What actually causes this:

Water exposure or connector corrosion on defrost sensor

First Thing to Check

Check if fridge is defrosting properly — excessive frost means sensor may have failed

Parts Involved

Fridge Defrost ThermistorMain PCB CN30 Connector

How to Fix

  1. 1

    1. Unplug refrigerator

  2. 2

    2. Inspect and test CN30 connector pins 1 and 6

  3. 3

    3. Measure voltage — expected 4.5V to 1.0V range

  4. 4

    4. Reseat connector securely

  5. 5

    5. Plug in and check error status

  6. 6

    6. If error persists, replace fridge defrost sensor

This Error Applies To

Samsung RF22N9781 Series Refrigerators (2018) (2018–present)

Service manual exact match: RF22N9781Service manual exact match: RF28N9780

Related Error Codes

1

Freezer temperature sensor malfunction

6

Room temperature sensor not working

14

Ice maker temperature sensor failure

2

Fridge temperature sensor is not responding

9

Convertible zone temperature sensor failure

15

Ice storage area temperature sensor malfunction

4

Freezer defrost sensor is faulty

11

Convertible zone defrost sensor malfunction

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