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Heat comes on when the temperature setting calls for cool.

Can anyone point me in the right direction to solve this issue.
I have a Carrier AC/Heat pump with a totaline thermostat. Heat comes on when the temperature setting calls for cool.

The airhandler model is FY4ANF030, the compressor is 25HBA33OA003, and the Totaline thermostat is a P474-0100.

It was working fine and is about 4 years old.

Thanks
Ken

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Getting heat in the cooling mode leans toward the reversing valve in the outside unit. it changes the flow of refergerint so that the hot air you get outside in the summer is blown inside in the winter. another possibility is that the reversing valve isn't getting 24v check to see if you have 24v at O and C either at the t-stat, furnace, or the outside unit. if you check at the furnace rember the safty switch for the lower door if that switch is open you will have no power. i would look at the t stat first if you have 24v there go to the outside . 24v present outside will mean a bad valve or board, no 24v means a bad or broken conection in the control wire between the stat and the outside unit(usally the orange wire)

Posted on Jul 11, 2010

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Posted on Jan 02, 2017

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