Cold Blast? Fix Your Furnace & Bring Back the Heat in St. Charles, MO!

Went out to St. Charles, MO due to a customers system running and blowing cold air when it should be heating the house. Our Tech went down to the furnace and visually inspected the system. Ran the furnace and checked the airflow, electrical, and safety components. The board does not have any error codes stored. All equipment is currently working properly. She states the thermostat battery have never been changed in 10+ years. The system is ran with 4 wire so these batteries control the operation of the thermostat at all times. Bad batteries could result in the system not coming on.

Location: St. Charles, MO