Arrived onsite for heating maintenance gas fired furnace located in basement. Basement Furnace unit: Ask customer to turn heat on and confirmed operation. Changed Aprilaire 210 filter provided by homeowner. Confirmed operation of humidifier. Brushed and Wiped down furnace blower cabinet and gas burners. Burners fired and are in good working order. No visual impingement detected. Checked electrical. Cleaned the flame sensor. Measured heat rise at 52 degrees. System is operating as it should.
