1ST CLEAN AND CHECK UNDER SERVICE AGREEMENT FOR 10YR HEATING UNIT. CHECK ALL ELECTRICAL CONNECTIONS, HEAT EXCHANGER, HIGH LIMIT CONTROL, AIRFLOW, HUMIDIFIER, FAN CONTROL, THERMOSTAT, AIR FILTER, AND MANIFOLD GAS PRESSURE FOR PROPER VENTING. CLEAN AND CHECK BURNERS AND BURNER OPERATION. LUBRICATE ALL NECESSARY MOVING PARTS, AND ADJUST BLOWER COMPONENTS.