I'm working on a Bryant Heat Pump, model #657ANX042000AANF in Phoenix. Last night it got down in the 20's. Complaint is that there is cold air blowing in heat mode during the night. I jumped defrost board - it cycles, reversing valve OK, outdoor fan motor stops. Problem is that indoor fan motor continues to run. There are no heat strips on unit to need the indoor fan motor. I disabled the timer for now so that defrost does not run (the jumper was set to 90 min).
Does this sound like a problem with the board?