Error code reference

Samsung Air Conditioner Error Code P4

Reverse phase or open phase error - 3-phase power phase order is reversed or one or more phases are missing.

SourceSamsung Air Conditioner - Service Manual: Troubleshooting (AVMWH020CA0XAG)p. 6-58, 6-60

Samsung codes Samsung air conditioner codes

Diagnostic procedure

The full P4 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

Check L1(R)-L2(S), L1(R)-L3(T), and L2(S)-L3(T) phase voltages; if a terminal lacks normal voltage, check external power supply.

SourceSamsung Air Conditioner - Service Manual: Troubleshooting (AVMWH020CA0XAG)p. 6-58, 6-60

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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

8 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 P4 procedure

Where this code is documented

Models covered by the manuals that document this code

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