Duo Therm Heat/AC function question
I'm now sitting in the south, fortunately, I have two roof heat pumps so we are comfortable enough with that AC running. The rear unit was installed new with the front unit in 2oo9, both are clean and...
Forum Discussion
If it is a heat pump, the reversing valve solenoid has to energize for it to run in cool mode. You either have a stuck reversing valve, a defective reversing valve solenoid, or the control board for the unit is defective and not causing the solenoid to energize. It's an easy diagnosis for someone familiar with these units, or you can wait and get every kind of armchair diagnosis here and then take it to a shop.
