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Error code reference
GE Heat Pump Error Code 42
High pressure switch open - switch circuit detected open for 30 seconds after 3 minutes of compressor run time.
SourceDuctless Multi-Split Heat Pump - Full Service ManualB-23, J-26
Diagnostic procedure
The full 42 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
Short the high pressure switch terminal on PCB to test; check switch continuity; check for dirty coils, overcharge, or restrictions.
SourceDuctless Multi-Split Heat Pump - Full Service ManualB-23, J-26
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 GE heat pump.
Models covered by the manuals that document this code
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