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Blower stays on even when AC turned off.

 
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Doreen
Level 1 Apprentice DIY


Joined: 23 Jul 2009
Posts: 1

PostPosted: Thu Jul 23, 2009 6:07 pm    Post subject: Blower stays on even when AC turned off. Reply with quote

I have a 21 year old 396A Payne HVAC It has been extrememly hot 105 and air conditioning is working but the blower in the furnace remains on, even when the AC is turned off. Could this be a swith, or control cirquit board? We changed the Thermostat but that was not it. Please Help, driving me crazy! Thanks!
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Virtual Repairman
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Joined: 06 Jul 1999
Posts: 3210
Location: Austin, TX

PostPosted: Thu Jul 23, 2009 6:11 pm    Post subject: furnace Reply with quote

The fan is supposed to cycle off about 30 seconds after the outside unit stops cooling. This is done to utilize every last bit of cooling from the evaporator coil as the pressures equalize. For the fan not to shut off indicates a failed control board, as the fan relay is powered by it. I'm not privy to your specific wiring diagram, but on certain models, the relay for the fan is replaceable separately. If the relay contact are merely stuck, this could be an option. Sorry I don't have a part source for you.
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