As of this morning, my heat pump is working. I did a visual inspection and there are no burnt or disconnected wires, no bulging capacitors, and there is 240V present. The heat pump isn't making any buzzing or clicking noises. I'm wondering if the issue is with the thermostat. I can hear the relays click when I turn the heat on. What are some tests I can do to isolate the issue? The heat pump is a Goodman and the thermostat is a 3M filtrete programmable unit with C, O, W2, Y, RH, RC, and G wires (RH AND RC jumpered). Five wire electric heat pump with auxiliary heat. Indoor unit (air handler) is a two year old Goodman ARUF 2-1/2 ton. Outdoor unit is 12 years old BTW. And last night was the coldest night of the year so kind of ironic. Can I short a couple terminals together at the thermostat to see if the heat pump then turns on? I'm getting 27Vac on G, RH/RC, and Y. No voltage on any other wires. According to the manual, Y is "cool control", so I'm not sure why it has voltage. Y has 27V regardless if in heat or cool mode. Heat pump doesn't turn on in cool mode either and there is no voltage on RH/RC when the thermostat is off.

Hello, I have a Lennox Whisper Heat Unit that is not working. Ive tried a couple of fixes and still it is not working. When I fired it up for the first time this season it worked fine. One morning I fired it up and nothing happened. Typically when I turn the thermostat to the desired temperature, the thermostat makes a "click" sound and then the heat can be heard as the electric pilot sparks "click click click" followed by the "whoosh" of the gas igniting. However, after the thermostat clicks, the heater is not making it's sounds and it is not coming on. I checked the power and gas to the unit, both are working. When I turn the blower fan only on, it comes on and blows garage temperature air into the house. But, the heater is not activating. First I changed the flow regulator and nothing changed. Next, I changed the ignition control box and again nothing changed. So, I'm looking for possible names to my problem and cures for it. Thanks!