Error code reference

Samsung Air Conditioner Error Code E466

Compressor over current error by compression ratio - ratio of (High pressure + 1) / (Low pressure + 1) exceeds 8.5 for over 10 minutes.

SourceSamsung Air Conditioner - Service Manual: Troubleshooting (AVXC4H056EB)p. 12-19

Diagnostic procedure

The full E466 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
1
First diagnostic step
Connect S-net and manifold gauge, verify service valve is fully open.

SourceSamsung Air Conditioner - Service Manual: Troubleshooting (AVXC4H056EB)p. 12-19

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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