Question about Heating & Cooling
That would only really happen due to one of two things.
A bad thermostat.
A stuck relay. If the relay to the AC is stuck closed then it would come on whenever power goes through to the furnace.
This would be rare because very few units had that type of setup.
You can verify the T-stat by removinf the tsat from the wall. disconnect the red, white and yellow wires. Touch red to white.
If the heat comes on and the AC stays off, then your Tsat is bad.
Posted on Jan 17, 2009
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Posted on Jan 02, 2017
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