PERFORM MAINTENANCE CHECK-UP FOR 5YR HEATING UNIT. CHECK THERMOSTAT, HUMIDIFIER, ENERGY CONSUMPTION, AIRFLOW, AIR FILTER, CHECK HEAT EXCHANGER, HIGH LIMIT CONTROL, AND ALL ELECTRICAL CONNECTIONS. CLEAN AND CHECK BURNERS AND BURNER OPERATION. LUBRICATE ALL NECESSARY MOVING PARTS, AND ADJUST BLOWER COMPONENTS. CHECK MANIFOLD GAS PRESSURE AND FOR PROPER VENTING.