1ST CLEAN AND CHECK FOR A 6YR HEATING SYSTEM UNDER SERVICE AGREEMENT. CLEAN BURNERS AND BURNER OPERATION. CHECK THERMOSTAT, HIGH LIMIT CONTROL, HEAT EXCHANGER, FAN CONTROL, ENERGY CONSUMPTION, AIR FILTER, HUMIDIFIER, AND ALL ELECTRICAL CONNECTIONS. LUBRICATE ALL NECESSARY MOVING PARTS, AND ADJUST BLOWER COMPONENTS. CHECK GAS PRESSURE AND FOR PROPER VENTING.