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Samsung Refrigerators2018–present

Error Code 29

Convertible zone defrost heater not working

Critical

Stop using immediately - risk of damage or safety issue

Also displayed as: 29C

What This Means

Heater wire harness disconnected at Main PCB CN70_1 pins 7 and 1; Heater element open circuit or burned out; Heater shorted to ground; Bimetal overheating protector tripped; Main PCB defective

What actually causes this:

Defrost heater element failed or thermal protection activated

First Thing to Check

Check if the convertible zone has frost accumulation — indicates heater failure

Parts Involved

Convertible Zone Defrost HeaterThermal Fuse 110°CBimetal ThermostatMain PCB CN70_1 Connector

How to Fix

  1. 1

    1. Unplug refrigerator

  2. 2

    2. Disconnect Main PCB CN70_1 wire from PCB

  3. 3

    3. Measure resistance between CN70_1-7 and CN70_1-1 — normal 63 ohm ± 7%

  4. 4

    4. If 0 ohm: heater is shorted, replace heater

  5. 5

    5. If infinite: wire or bimetal is open, replace heater

  6. 6

    6. If normal: check thermal protector and fuse operation

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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