My HVAC system is a heat pump. The air handler is a Payne and the heat pump is a Carrier. I was having trouble last summer with the AC not blowing very cool air, it turned out the heat strips were on. The AC tech who was working on it disconnected them saying we don't need them where we live. He was wrong.
Whenever my heat pump goes into defrost mode the unit blows cold air. I hooked the strips back up, but I would like to resolve why they come on with AC too. The tech only had to disconnect the white wire that runs from the pump to the handler to get them to shut off. He said that there must be a short somewhere. Before I run a new control wire between the two units I would like to confirm that the white wire is hooked up properly to the heat pump. I would also like to know if anything else could cause this.
Also after hooking back up the heat strips they come on even if the unit is not in defrost mode.
The Carrier has a model number 540JJ03U
My thermostat is a LUX 1500
At the thermostat Y & W are jumpered together and the white wire is not used.
At the air handler the the yellow from the thermostat and heat pump are tied together and the white wire from the heat pump is hooked up.
At the heat pump the yellow wire goes to Y and the white wire goes to W1 (W2 & W3 are unused). The from here the white wire goes to the blue wire on the defrost and the yellow goes to the black wire.