MAINTENANCE TUNE-UP FOR 3YR HEATING UNIT. CLEAN AND CHECK BURNERS AND BURNER OPERATION. LUBRICATE ALL NECESSARY MOVING PARTS, AND ADJUST BLOWER COMPONENTS. CHECK HUMIDIFIER, THERMOSTAT, AIR FILTER, AIRFLOW, HEAT EXCHANGER, HIGH LIMIT CONTROL, FAN CONTROL, HUMIDIFIER, GAS PRESSURE, AND ALL ELECTRICAL CONNECTIONS.