Error Code 81

Compressor won't start or keep running

Also displayed as: 81C

What This Means

Inverter PCB soldering defect or short circuit; DC 15V supply below 13.5V from SMPS; Compressor mechanical failure or stuck piston; Compressor thermal protection activated; Inverter gate drive circuit failure

First Thing to Check

Parts Involved

How to Fix

1. 1

   1. Check SMPS DC 15V output — must be at least 13.5V

2. 2

   2. Inspect Inverter PCB for visible solder bridges or short circuits

3. 3

   3. Check all Inverter PCB components for overheating or damage

4. 4

   4. Attempt force run in diagnostic mode to test compressor

5. 5

   5. Listen and feel for compressor mechanical operation

6. 6

   6. If compressor still doesn't run, check compressor power connections

7. 7

   7. If power and inverter are normal, compressor may be mechanically stuck

Parts Commonly Needed for This Error

OEM part numbers confirmed by retailers

This Error Applies To

Samsung RF22N9781 Series Refrigerators (2018) (2018–present)