goodman heat pump

Old 06-01-08, 07:07 PM
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Question goodman heat pump

I have a 3 ton goodman heat pump that will not come on. The contacts will not pull in, but to press in the unit and compressor come on. this made me think it was a 24 volt problem. I changed the thermostat,transformer and contacts and the unit will not come on. any advice, I would be greatfull for

Old 06-01-08, 08:05 PM
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Sounds like you just wasted a bunch of money.

Troubleshooting is logical, not parts changing.

1. Is the tstat actually sending 24 volts (+/-) to the air handler to start the fan and compressor?

2. Is the indoor fan coming on and nothing outdoors?

3. If #2 is true and the outdoor is not coming on is the 24 volts reaching the outdoor unit?

Follow the voltage to find the problem.

You may have a bad board in the indoor/outdoor unit or a broken wire somewhere, you did not say whether the indoor fan ran or not.
Old 06-01-08, 08:08 PM
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Volt/Ohm Meter.

Do you own a volt/ohm meter?... Buy one ( if you know how to use it - If not, call a tech) before you change out the AHU and Condenser! ( Sorry, just kinda funny!)
Old 06-01-08, 08:11 PM
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I would suspect that there is a break in your wiring from the thermostat to the outside unit. Weed eaters are notorious for inadvertently cutting into the wiring or you could have a puppy dog or squirrel that needed a place to sharpen there teeth lol. I would closely inspect the wiring outside from the unit to where it enters the structure first and of course underneath the house if it is possible for the puppy to have access under there. If everything looks good there then lets make sure that we have a fresh battery in our thermostat (if it requires batteries) and lets pull the thermostat cover off and use a volt meter to check for 24 volts from the R to the C terminals. Post back if you get that far and have not resolved your problem.

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