Error Code R3
Compressor has failed and stopped operating
Critical
Stop using immediately - risk of damage or safety issue
Also displayed as: R3 (R-ROOM STEP 3 LED blinking)
What This Means
Compressor internal mechanical failure; IPM fault on inverter PCB (IGCM04G60HA); Short between compressor U, V, W phases (CN102); Short among IC3 pins #1 to #24 on inverter PCB; DC operating voltage dropped below 13.5V
What actually causes this:
Compressor mechanical failure, inverter PCB IPM fault, or low DC bus voltage
First Thing to Check
Check DC 16V output at inverter PCB and inspect CN102 compressor wiring for shorts
Parts Involved
How to Fix
- 1
Check inverter PCB LED blink pattern to identify specific sub-fault
- 2
Check compressor wire connections at CN102
- 3
Check soldering status of inverter PCB for short-circuited parts
- 4
Check if DC 16V output is below 13.5V
- 5
Check compressor and refrigerant cycle for restriction or blockage
- 6
Wait 5 minutes after fault — compressor enters standby, RPM signals ignored
This Error Applies To
Samsung RT21M6215 Series Refrigerators (2017) (2017–present)
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