CLEAN AND CHECK HEATING SYSTEM. CHECK THERMOSTAT, CHECK GAS PRESSURE AND FOR PROPER VENTING. CHECK HUMIDIFIER, ALL ELECTRICAL CONNECTIONS, HEAT EXCHANGER, HIGH LIMIT CONTROL, AND AIRFLOW. CLEAN AND CHECK BURNERS & BURNER OPERATION. LUBRICATE ALL NECESSARY MOVING PARTS, AND ADJUST BLOWER COMPONENT. EVERYTHING RUNNING GREAT.