Error Code 12
Freezer defrost cycle fails or takes too long
Critical
Stop using immediately - risk of damage or safety issue
Also displayed as: Left - ⑦ LED ON
What This Means
Defrost heater malfunction; Defrost thermistor failure; Excessive frost buildup; Heater thermal fuse open; Heater contact failure
What actually causes this:
Defrost heater element burns out or thermal fuse fails from overcurrent
First Thing to Check
Verify heater resistance is reasonable and thermal fuse not blown
Parts Involved
How to Fix
- 1
Separate MAIN PCB CN70 wire from PCB
- 2
Read resistance between CN70 Brown and Black terminals
- 3
Compare with circuit diagram reference values
This Error Applies To
Samsung RS25J50 Series Refrigerators (2010) (2010–present)
Related Error Codes
Damper heater not responding or circuit open
Room temperature measurement not functioning
Defrost heater temperature sensing not working
Compressor fails to operate or protection activated
Ice maker sensor malfunction or connection issue
Microcontroller communication failure between boards
Ice maker ejection or level detection malfunction
Freezer evaporator fan not operating properly