1ST CLEAN AND CHECK UNDER SERVICE AGREEMENT FOR 4YR HEATING SYSTEM. CHECK THERMOSTAT, AIR FILTER, AIRFLOW, HUMIDIFIER, HEAT EXCHANGER, HIGH LIMIT CONTROL, FAN CONTROL, ENERGY CONSUMPTION, AND ALL ELECTRICAL CONNECTIONS. CLEAN AND CHECK BURNERS AND BURNER OPERATION. CHECK MANIFOLD GAS PRESSURE AND FOR PROPER VENTING. LUBRICATE ALL NECESSARY MOVING PARTS, AND ADJUST BLOWER COMPONENTS.