Error code reference

Samsung Air Conditioner Error Code E504

Oil return operation (not an error, special mode to recollect compressor oil every 7 hours for 3 minutes).

SourceSamsung System Air Conditioner - Full Service Manual (Multi-Unit)p. 3-3, 11-25

Samsung codes Samsung air conditioner codes

Diagnostic procedure

The full E504 procedure

Step 1 is visible so you can confirm you are on the right page. The remaining steps, the ones that tell you whether to actually replace a part, unlock with any pass.

MyPros+ · DiagnosticsStep 1 preview

First diagnostic step

Measure resistance between compressor terminals; check for OLP trip condition.

SourceSamsung Air Conditioner - Service Manual: Troubleshooting (AVMKH020CA1)p. 222, 262-263

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More steps, wiring diagram references, and verified part numbers

Includes expected resistance and voltage values, connector pinouts, and supersession notes for replacement parts.

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Where this code is documented

5 manuals in the MyPros+ library document this code for Samsung air conditioner.

Models covered by the manuals that document this code

More models are covered than are listed here.

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The full E504 procedure

Where this code is documented

Models covered by the manuals that document this code

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