1ST MAINTENANCE CHECK-UP PER SERVICE AGREEMENT FOR 3 YEAR HEATING UNIT. CLEAN AND CHECK BURNERS AND BURNER OPERATION. LUBRICATE ALL NECESSARY MOVING PARTS, AND ADJUST BLOWER COMPONENTS. CHECK MANIFOLD GAS PRESSURE AND FOR PROPER VENTING. CHECK THERMOSTAT, FAN CONTROL, HIGH LIMIT CONTROL, HEAT EXCHANGER, AIR FILTER, AIRFLOW, ENERGY CONSUMPTION, AND ALL ELECTRICAL CONNECTIONS. EVERYTHING IS OPERATING GREAT.