Error code reference

Samsung Heat Pump Error Code P721

Outdoor unit SUMP DOWN 1 protection control - SUMP temperature maintained over 95°C for 5 minutes.

SourceSamsung Heat Pump - Service Manual: Troubleshooting Guide (AVMBH020CA0XAG)p. 221, 256

Diagnostic procedure

The full P721 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 compressor loading/unloading via S-net; check PWM valve; check temperature sensor attachment.

SourceSamsung Heat Pump - Service Manual: Troubleshooting Guide (AVMBH020CA0XAG)p. 221, 256

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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

2 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 P721 procedure

Where this code is documented

Models covered by the manuals that document this code

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