Error Code 02
Microcontroller communication failure between boards
Critical
Stop using immediately - risk of damage or safety issue
Also displayed as: Right - ② LED ON
What This Means
Communication line open or short; Noise on communication line; Main PCB malfunction; Panel PCB malfunction
What actually causes this:
Solder joint cracks or loose connectors between main and panel boards
First Thing to Check
Verify main PCB and panel PCB connectors are fully seated
Parts Involved
How to Fix
- 1
Requires oscilloscope to verify communication signal
- 2
Check for continuity on signal lines
- 3
Test after replacing main or panel PCB
Other Error Codes for RS25J500DSR
Defrost heater temperature sensing not working
Damper heater not responding or circuit open
Compressor fails to operate or protection activated
Ice maker sensor malfunction or connection issue
Ice maker ejection or level detection malfunction
Freezer evaporator fan not operating properly
Refrigerator compartment temperature measurement failure
Freezer temperature sensor not responding