CLEAN AND CHECK HT. CHECK THERMOSTAT, CHECK AIR FILTER, CHECK HEAT EXCHANGER, CHECK HIGH LIMIT, CHECK AIR FILTER, CHECK GAS PRESSURE AND FOR PROPER VENTING, CHECK ALL ELECTRICAL CONNECTIONS, CHECK HUMIDIFIER. CHECK BURNERS AND BURNER OPERATION. ADJUST BLOWER COMONENTS, LUBRICATE ALL NECESSARY MOVING PARTS. REPLACE UV LIGHT UNDER WARRANITY. EVERYTHING IS RUNNING GREAT.