WINTER MAINTENANCE TUNE-UP FOR 6YR HEATING UNIT. CHECK THERMOSTAT, AIR FILTER, HEAT EXCHANGER, HIGH LIMIT CONTROL, GAS PRESSURE, FAN CONTROL, ENERGY CONSUMPTION, HUMIDIFIER, AIRFLOW, AND ALL ELECTRICAL CONNECTIONS. LUBRICATE ALL NECESSARY MOVING PARTS, AND ADJUST BLOWER COMPONENTS. CLEAN AND CHECK BURNERS AND BURNER OPERATION.