Just need some advice I've had an issue with the outdside unit, a Payne PH10JA060, freezing up and not going into a defrost cycle unless either the Orange and Red wires are crossed OR the unit is put into Air Conditioning mode. The contractor initially said the defrost board was bad and replaced the board and sensor. Well, it appears there is something else going on. He has now replaced the defrost board a total of 3 times. They now say there is a short somewhere but they can't find it and it's causing the defrost boards to go bad. They want to replace the reversing valve but he's not sure that will fix the problem and I may need a whole new unit.
I would love to get some thoughts on this from the Pros. I've got a second company coming out to take a look but would love some advice before they come out.