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Error code reference
Samsung Heat Pump Error Code P731
Outdoor unit SUMP DOWN 1 protection control - SUMP temperature over 95°C for 5 minutes.
SourceSamsung Heat Pump - Service Manual: Troubleshooting Guide (AVMCH072CA0)p. 221, 256
Diagnostic procedure
The full P731 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
Check digital compressor loading/unloading; check PWM valve; check temperature sensor attachment.
SourceSamsung Heat Pump - Service Manual: Troubleshooting Guide (AVMCH072CA0)p. 221, 256
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
75,000+ service documents · 20,000+ error codes · 100+ brands
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