05/27/2025- I arrived on site to test the unit and found that the unit was working properly. However this unit’s issue is that it will cool properly and then start heating the house instead of cooling after it has run for a while. The issue didn’t happen while I was here but I have verified that the thermostat wire, condenser control board, and reversing valve solenoid are all working properly. This just leaves the T6 thermostat, which according to the symptoms I heard about while discussing this with the customer sounds pretty definitive. The customer has approved of the estimate to replace this faulty thermostat, but is busy today, she said that Wednesday afternoon would work best. In the meantime I told her to turn the faulty thermostat off whenever she is away from home to prevent the thermostat from heating the house incorrectly since her other unit will keep the house cool in the meantime.