MAINTENANCE TUNE-UP FOR HEATING UNIT. CHECK ALL ELECTRICAL CONNECTIONS. CLEAN AND CHECK BURNERS AND BURNER OPERATION. CHECK THERMOSTAT, AIR FILTER, HUMIDIFIER, HEAT EXCHANGER, HIGH LIMIT CONTROL, AND GAS PRESSURE AND FOR PROPER VENTING. ADJUST BLOWER COMPONENTS AND LUBRICATE ALL NECESSARY MOVING PARTS. EVERYTHING IS WORKING FINE.