Error code reference

Goodman Heat Pump Error Code 08

Low line voltage (less than 185 VAC) or high line voltage (greater than 255 VAC) detected by control.

SourceGoodman Heat Pump - Full Service Manual: GSX/GSZ Series R-410Ap. 86-87

Diagnostic procedure

The full 08 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 circuit breakers and fuses. Verify unit is connected to proper power supply per rating plate. Contact local utility if needed.

SourceGoodman Heat Pump - Full Service Manual: GSX/GSZ Series R-410Ap. 86-87

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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

1 manual in the MyPros+ library documents this code for Goodman heat pump.

Models covered by the manuals that document this code

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The full 08 procedure

Where this code is documented

Models covered by the manuals that document this code

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