What action must be taken if cracks are found in the Heat Exchanger of a Furnace?

When cracks are found in the heat exchanger of a furnace, the most appropriate action is to replace the heat exchanger. This is because the heat exchanger is a critical component responsible for transferring heat from the combustion gases to the air circulating through the home. If it is cracked, it can lead to dangerous scenarios such as carbon monoxide leaking into the living space, reduced efficiency, and potential breakdown of the furnace.

Sealing the cracks or attempting to repair them with adhesive is not a viable long-term solution, as it may not fully restore the structural integrity and safety of the heat exchanger. Simply evaluating the performance without addressing the cracks ignores the serious risk posed by any structural failure. Therefore, the only safe option that ensures the heat exchanger operates as intended and protects the occupants from potential hazards is to replace it.