Fall heater tune up one system. Upon arrival the thermostat had been disconnected from the internet and mobile device. The thermostat was reset and reconnected to the internet as well as the homeowners phone. The system was then turned on in heat mode and tested. The blower motor, heat exchanger, burners, flame sensor, furnace safeties, vent system, gas lines, hot surface igniter, and electrical connections were all inspected. The filter was changed with one provided by the homeowner. The system is heating properly at this time.