Arrived onsite for heating maintenance 1 gas fired furnace. Turn heat on and confirmed operation. Brushed and Wiped down furnace blower cabinet and gas burners. Burners fired and are in good working order. Minor visual impingement detected. Observed dancing flame which may cause rollout to trip in the future. Checked electrical. Measured 34 degree heat rise. Cleaned the flame sensor. System is operating but may need upgrading due possible future flame rollout issue.
