How do I fix error code FREEZER-DEFROST-ERROR on a Samsung refrigerators?

1. undefined: Disconnect MAIN PCB CN20 connector 2. undefined: Measure resistance between CN20-'6' ↔ CN20-'8': should be 63Ω (230V) or 63Ω (for 120V model) ± 7% 3. undefined: 0Ω = heater short circuit; ∞Ω = heater or bimetal open circuit 4. undefined: Also check F-DEF heater directly: CN70 '5' (BRN) ↔ CN71_1 '5' (BLK), expected ~63Ω ± 7% 5. undefined: Must power off refrigerator before measuring resistance

Samsung Refrigerators2022–present

Error Code FREEZER-DEFROST-ERROR

Freezer defrost heater or its safety components have failed

Critical

Stop using immediately - risk of damage or safety issue

Also displayed as: F and R blink (defrost heater error pattern)

What This Means

Open defrost heater element; Blown thermal fuse (228-230°F / 109-110°C); Open bimetal (tripped at 140°F / 60°C, resets at 104°F); Short circuit in heater wiring

What actually causes this:

The heater that melts frost off the freezer evaporator coils has burned out or a safety cutout has blown, meaning frost will build up until the freezer stops cooling.

First Thing to Check

Look inside the freezer — if there is a thick layer of ice on the back wall/evaporator cover, the defrost system has failed.

Parts Involved

Freezer defrost heater AC 120V 200WBimetal (OFF 140°F, ON 104°F)Thermal fuse AC 250V 10A (OFF 228-230°F)MAIN PCB CN20

How to Fix

1
Disconnect MAIN PCB CN20 connector
2
Measure resistance between CN20-'6' ↔ CN20-'8': should be 63Ω (230V) or 63Ω (for 120V model) ± 7%
3
0Ω = heater short circuit; ∞Ω = heater or bimetal open circuit
4
Also check F-DEF heater directly: CN70 '5' (BRN) ↔ CN71_1 '5' (BLK), expected ~63Ω ± 7%
5
Must power off refrigerator before measuring resistance

This Error Applies To

Samsung RF25C5 Series Refrigerators (2022) (2022–present)

Service manual exact match: RF25C5151SR/AAService manual exact match: RF25C5151**Service manual exact match: RF25C5551**Service manual exact match: RF25C5551SR/AA