Question about Honeywell Electronic Programmable Heat/Cool Thermostat - CT3300A100 Heater

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Went from Analog thermosat to a Honeywell 5000 series Digital Thermostat. Worked fine all winter. Now, when I put it on Cool it pushes out Heat. This is a Trane Heatpump.

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Look to see if you have it wired correctly with the o terminal be used and then check to see if you have a jumper wire between the Y and W terminal on the Base of the tstat where you hooked all the wires up.

Posted on Feb 14, 2009

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