The control board has NOTHING----NOTHING to do with the AC model number. The control kits are separate from the AC. There are various boards and kits for the roof top AC units. So, you CANNOT give a Dometic AC model number and expect to get the correct control board. You use the OLD control board for the part Number. But, if BOTH roof AC's are identical, use the other AC control board to verify the correct Part Number. The Heat from either the compressor or the fan motor will NOT cause a problem on either one. You could have a defective fan capacitor that is not sending the correct voltage to the fan and it is running hot. But, you could just swap out the parts from the other AC unit to verify which parts are defective. Doug