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sameeryande · Jun 6, 2007, 04:20 PM

I've Goodman forced air heating and Goodman A/C (compressor). The moment I put A/C on the 3A fuse blows on the circuit board which in the blower compartment of the furnace. Heat and blower work fine. Earlier nothing was working, it took a long time for me to narrow down the problem of fusing getting blown and when it was getting blown. To me it looks like either the condenser is faulty or there is some kind of short circuit. I'd hate to pay somebody arms and legs if it's a trivial problem which can be corrected by myself. Can somebody please help me? The unit is just over year old.:confused:

Sorry for the repost but I didn't see an answer/closure on the other thread.

Thanks for your help.
Sam

hvacservicetech_07 · Jun 6, 2007, 05:13 PM

I'd say your problem is in the low voltage wires between the furnace and the condenser, shut off the power to the outdoor unit, remove the cover and disconnect the two low voltage wires and cap them off, start the system up, if you still blow the fuse, you have a broken wire and may need to replace the wire between the furnace and a/c, if it doesn't blow, you have a shorted contactor coil.

sameeryande · Jun 18, 2007, 09:11 AM

Sorry for the delayed response... I did try to troubleshoot as you said... the fuse doesn't blow when I remove the low voltage wires from the contactor which means, the contactor is faulty?? Now the question is how do I get it? I called one plumbing supply which probably carry it (or can order it) but they would sell it to only licensed contractors. Now how do I go about that. Help :rolleyes:

Thanks for the response.

hvacservicetech_07 · Jun 18, 2007, 05:41 PM

I'd say the contactor coil is shorted, you should be able to find it at any heating and air company.

sameeryande · Jun 21, 2007, 08:52 AM

I replaced the contactor (getting that part was a challenge, no store would just sell it to me as I'm not a contractor. How I got it is a story over few Heinekens), replaced 3amp fuse. I turn on AC nothing happens, I'm like SOB... but then I lowered the temperature further down and the A/C kicked on, SUCCESS!!

All thanks to you for the guidance, I just hope it's a permanent fix and doesn't fail again, at least not in near future ;)

Now is there a way I can find out if the coil on the old one is really shorted? Do I measure resistance between two ends of the coil? It should be 0 if its shorted, if not do we know who much it should be? Or is there a different way to check the coil?

Special thanks to hvacservicetech, esquire1 for their invaluable advice.