gtrman
Oct 30, 2012, 06:18 PM
The ac compressor runs when the furnace is in heat mode new thermostat installed
ma0641
Oct 30, 2012, 07:04 PM
Is it a gas heater or a heat pump? If it is a gas heater, the wiring is wrong. If it is a heat pump, the compressor should be running.
ballengerb1
Oct 30, 2012, 07:12 PM
You have wired it incorrectly. We need to know the colors of each wire and where they were attached tio the old thermostat and which new stat you bought. I suspect your blue wire is the problem.