. Upon arrival found the ac running and the fan for the furnace wasn’t. System is completely frozen over. Checked voltage for blower. I had high voltage but not low voltage. Went it the thermostat and set it to fan on. Fan came on. Explained to the customer it could be the thermostat or board. Told him we will call Trane on Monday and get pricing and availability. Also told him to let the system unfreeze until he uses the ac.