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Phil
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 8769
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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My power went out earlier today and now the ac won't turn

This answer was rated:

Hello. My power went out earlier today and now the ac won't turn on.
JA: I'll do all I can to help. How long have you been dealing with this?
Customer: Since this afternoon. About 8 hours
JA: Do you plan on doing the work yourself?
Customer: If I can
JA: Anything else we should know to help you best?
Customer: I dont think so

Greetings, access the printed circuit board, it is mounted on the blower, the blower access door is on the furnace/air handler.

Look for burn marks on the board, if you see no burn marks, look for a yellow 3 amp automotive type fuse on the board, if its blown replace it.

Beyond that you need a multi meter to measure voltage between R and C on the thermostat terminal strip on that same printed circuit board. tell me what you find, we can go from there.

So far I suspect damage to the printed circuit board or thermostat electronics

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Important note about RATING my work:

I am a retired mechanical engineer and HVAC/electrical/ refrigeration and boiler contractor... with 56 years in this business. The last 20 of those years consulting for major firms nationally..

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All I ask is please respect me and my input by selecting the***RATING LINK***at the top of your page, that is the only way I am credited through the site.Rating does not affect your charges nor ability to refund if not satisfied.

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If you need to be coached through a full diagnosis/repair,and wiring etc. for up to two days, and wish to be trained to use test instruments...... that goes well beyond' Just a simple Answer' of course, and goes beyond what most other experts here offer.....rate my simple answer so far positively.. and I will deliver that training and coaching to you All on the same dime so to speak.

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Lacking a positive rating I can spend days helping a person at my own expense and loose my shirt,shorts and socks on the deal.

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Attach a close up photo of the wiring diagram glued to the inside of the blower access door and I will mark it up with troubleshooting instructions then follow up with step by step training and coaching until you have a solution.

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Photo must be exceedingly well focused. Use the 'add files' link next to your send button to get the photo to me.

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Phone call offers:

If you wish to accept the companies $25 phone call offer,if indeed they send you one, this will go a *lot faster, but it IS 100% optional... or we can continue here in this dialog box at no additional charge.

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