On June 9, 2021 I arrive to a new customer nonmember on arrival customer stated that his unit wouldn’t do anything check the thermostat is set for call and 75 and it read out 93 room temp I went to the air handler seeing that the unit had a popped fuse I unwired everything checked continuity unit had continuity between are in common causing the fuse to pop I remove common from the thermostat everything back up start of the unitAnd it fired up immediately I tested system operations everything’s working properly at this time thank you for your business Mike T