Error code reference

Samsung Heat Pump Error Code E123

Compressor down by low pressure protection control - low pressure sensor value under 2.6 kg/cm2G during cooling or under 1.4 kg/cm2G during heating.

SourceSamsung Heat Pump - Service Manual: Troubleshooting (RVXFHT100GA)p. 11-9, 11-15

Samsung codes Samsung heat pump codes

Diagnostic procedure

The full E123 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

Connect S-net and Manifold Gauge, then check if the service valve is fully opened.

SourceSamsung Heat Pump - Service Manual: Troubleshooting (RVXFHT100GA)p. 11-9, 11-15

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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

4 manuals in the MyPros+ library document this code for Samsung heat pump.

Models covered by the manuals that document this code

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The full E123 procedure

Where this code is documented

Models covered by the manuals that document this code

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