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Error code reference
Samsung Heat Pump Error Code P771
Outdoor unit compression rate 1 error - compression ratio over 8.5 for more than 5 minutes.
SourceSamsung Heat Pump - Service Manual: Troubleshooting Guide (AVMCH072CA0)p. 221, 258
Diagnostic procedure
The full P771 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 service valves; check PWM valve; check refrigerant; check indoor/outdoor EEV.
SourceSamsung Heat Pump - Service Manual: Troubleshooting Guide (AVMCH072CA0)p. 221, 258
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
1 manual in the MyPros+ library documents 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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