CLEAN AND CHECK HT. CHECK THERMOSTAT, CHECK BURNERS AND BURNER OPERATION, CHECK HUMIDIFIER, CHECK HEAT EXCHANGER, CHECK ALL ELECTRICAL CONNECTIONS, CHECK HIGH LIMIT CONTROL, CHECK GAS PRESSURE AND FOR POPER VENTING, CHECK AIR FILTER. ADJUST BLOWER COMPONENTS, LUBRICATE ALL NECESSARY MOVING PARTS. EVERYTHING IS RUNNING GREAT.