Samsung RF31FM Series Manual page 191

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6. Self Diagnosis & Trouble Shooting
6-7. When Compressor does not run (Inverter COMP.)
YES
COMP Connector(CN04)
is Good
YES
COMP ASS'Y is Good
YES
Normal
NO
1) Check the COMP Wire
2) Check the Compressor
NO
Replace COMP ASS'Y
To do list
191