A heat exchanger is a component of a furnace that is responsible for transferring heat from the combustion process to the air that is circulated through the house. It typically consists of a series of metal tubes or coils that are arranged in a way that maximizes the surface area for heat transfer. The tubes are heated by the furnace’s burners, and the air that is circulated through the furnace passes over the tubes, transferring heat from the tubes to the air. The heated air is then distributed throughout the house via the ductwork. The heat exchanger is an essential component of a furnace, and it plays a key role in the heating process.

There are several factors that can cause a heat exchanger to fail. One common cause is corrosion, which can occur when moisture or other contaminants come into contact with the heat exchanger. Over time, this can cause the heat exchanger to deteriorate and eventually fail. Another potential cause of failure is overheating, which can occur if the furnace is not properly sized for the house or if it is not adequately ventilated. In some cases, a heat exchanger may also fail due to a manufacturing defect or a lack of maintenance. Regular maintenance and proper sizing of the furnace can help to prevent heat exchanger failure.