Error code reference

Samsung Heat Pump Error Code P3

System down due to low pressure switch detection (low pressure lower than 1.2 kg/cm2G, system down after 2 detections within one hour).

SourceSamsung Heat Pump - Troubleshooting Guide: Error Codes & Diagnostics (RMAH180GAM0SER)p. 181, 186

Samsung codes Samsung heat pump codes

Diagnostic procedure

The full P3 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 if both service valves are open.

SourceSamsung Heat Pump - Troubleshooting Guide: Error Codes & Diagnostics (RMAH180GAM0SER)p. 181, 186

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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

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

Models covered by the manuals that document this code

75,000+ service documents · 20,000+ error codes · 100+ brands

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The full P3 procedure

Where this code is documented

Models covered by the manuals that document this code

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