No heat upon arrival Customer says he couldn’t get thermostat to respond. I checked thermostat and found it set for 72 but inside was 66 with not furnace on. Went down and checked furnace and it was off and not giving any error codes. Furnace was not receiving a call for heat. Checked back at thermostat and even though temperature was set higher it was sending a call for heat to the furnace, heating icon was not showing on thermostat. I removed thermostat from the wall and kept it off for 30 seconds to reset it. After resetting thermostat I turned the furnace on and it clicked on right away as it should. Cycled furnace multiple times and it came on and shutoff every time as it should. Customer asked me to help reset his winter schedule on the thermostat as well. Furnace ran with no issues after thermostat was reset. Customer said this is the first time he has had an issue with it, told customer that of issues occurred again that we would warranty out the thermostat for him and p