Arrived onsite for heating maintenance 1 gas fired furnace located in the basement. Homeowner mentioned thermostat is switching set temperature. Basement Furnace System: Turn heat on and confirmed operation. Changed filter provided by customer. Brushed and Wiped down furnace blower cabinet and gas burners. Burners fired and are in good working order. No visual impingement detected. Checked electrical. Measured .4 amps in the inducer motor. Cleaned and Measured 2.5 micro amps on the flame sensor. Measured .4 amps on the gas valve Measure temperature rise at 33 degrees. Performed Combustion Test. System is operating as it should. Inspected thermostat issues. Removed installer option for programing so system will no longer change thermostat set point
