Upon arrival system not operational. No 24v to unit during call for heat. Bypassed thermostat and unit kicked on. Thermostat has failed. Replaced thermostat with Honeywell T6 pro WiFi thermostat. Did not have WiFi T6 on hand. Installed standard T6 for temporary heating. Office will call to schedule return visit to install WiFi tstat. Signed up on club membership for routine maintenance and savings.