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