Error code
R3
Meaning
Refrigerator compressor will not operate or is operating abnormally
Critical
What to do
Why this happens
Possible causes for compressor start failure include a short circuit between compressor terminals or IPM (Intelligent Power Module) pins, an IPM module fault detection, abnormal current detection, motor restriction or locked rotor condition, excessive RPM detection, shunt resistance failure, low input voltage, or over-voltage condition.
How to fix it
This requires a professional technician to test the inverter board and compressor with specialized equipment
SourceSamsung service manual