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Error code reference
GE Heat Pump Error Code 45
System low pressure protection - undercharged, low defrosting temperature, or malfunction of fan motor.
SourceDuctless Multi-Split Heat Pump - Full Service ManualB-23, J-27
Diagnostic procedure
The full 45 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 low pressure switch terminal on PCB to test; check fan motor; check Te and Tc2 sensor resistance.
SourceDuctless Multi-Split Heat Pump - Full Service ManualB-23, J-27
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
75,000+ service documents · 20,000+ error codes · 100+ brands
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