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