Upon arrival found system to be off, turned on heat at thermostat and nothing came on. Checked air handler in attic to find high voltage disconnect in off position therefore no power to air handler. Turned power on to air handler and system still non operational. Checked for low voltage power and did not have. Checked transformer and transformer is bad, the reason the transformer went bad is because the thermostat that is on the wall is not compatible with the system and caused the transformer to short out. Will need to install correct thermostat, replace transformer and add in-line fuse to help save transformer from blowing out. Customer may provide thermostat if they can get in time.