13 POINT MAINTENANCE TUNE-UP UNDER 1ST SERVICE AGREEMENT FOR 7YR HEATING UNIT. CLEAN AND CHECK BURNERS AND BURNER OPERATION. ADJUST BLOWER COMPONENTS AND LUBRICATE ALL NECESSARY MOVING PARTS. CHECK MANIFOLD GAS PRESSURE AND PROPER VENTING. CHECK THERMOSTAT, AIR FILTER, AIRFLOW, FAN CONTROL, ENERGY CONSUMPTION, HUMIDIFIER, AND ALL ELECTRICAL CONNECTIONS. CHECK HEAT EXCHANGER AND HIGH LIMIT CONTROL.