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I have a Goodman heat pump and the condenser fan and compressor will not switch on. The board green light says improperly grounded or flame sensor not sensing flame (both are incorrect). The AUX heat (gas) fires up and runs as it should. I can press the contact relay switch down and the fan and compressor both will turn on. I have 240v going into the contacts but no voltage to the 24v side of the contacts. Any ideas where else to look?

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Does the indoor fan run? Place the fan switch in run. If it doesn't run then the transformer could be bad. Also, there could possibly be some high and low pressure switches that would keep you from getting the 24vac to the contactor. First rule out the thermostat by removing the face and installing a jumper wire between the R and Y terminals. This should make the outside unit run. If it does then your thermostat is not passing 24vac to the unit and should be replaced. If it doesn't run with the jumper in, then your problem is in the outside unit. Trace out the yellow wire from the thermostat in the outside unit and check the components that the wire goes through (high and low pressure switches). Let me know what you find so I can offer more help if needed.

Posted on Sep 16, 2010

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