Ac kicks on when furnace kicks on

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Old 12-19-16, 02:24 PM
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Ac kicks on when furnace kicks on

Hello all. I recently ran into the problem of my outside ac unit kicking on when my furnace kicks on preventing me from getting heat. I noticed that someone moved the fan switch on the thermostat to on so I moved it back to auto but the ac is still kicking on. My gas furnace is relatively new and is working fine. I flipped the breaker for the ac unit and am getting heat now but I would like to fix the problem do I need a new thermostat or.... any suggestions would be great thanks
 
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Old 12-20-16, 06:42 PM
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The only thing I can think of other than a bad thermostat or control board on the furnace is a short between the W & Y wires somewhere between the thermostat & the furnace. I would start at the thermostat just to make sure the wires aren't touching there. No one has recently replaced the stat or worked on the low voltage wiring have they?
 
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Old 12-22-16, 09:32 PM
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A thermostat configured for HP ( heat pump) would cause this issue.
This is sometimes a switch behind the thermostat.

Replacing the batteries in a thermostat might put someone in proximity to this switch.
 
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