Some signs of problems with a furnace heat exchanger include open cracks in various locations, rust peforations and thinning of the exchanger wall. Other signs include mechanical holes on the floor of the exchanger and sealant leaks.Continue Reading
If the heat exchanger develops open seams and cracks, there could be a problem with the appliance. This is caused by mechanical damage, heat loss and mechanical stress. As a result of constant expansion and contraction, the metal develops fatigue. This results to bending of the paperclip back and forth until it breaks. It causes the development of open seams that could lead to contamination.
Cracks arise from improper joints during manufacture preventing the full clipping of the seams. Cracks also develop from accidental dropping during shipping and installation. Rust perforations cause thinning of the heat exchanger wall. Rusting is caused by condensation leaks from air conditioners, humidifiers and wet locations on the furnace. It causes the thinning of the exchanger walls up to 50 percent of the original thickness of appliance.
Mechanical holes on the heat exchanger develop from loose screws and failure to close cleanout ports properly during cleaning. Gasket and sealant leaks can cause heat exchanger problems. The leaks can also develop from broken furnace seals, faulty crimped rings and faulty gasketsLearn more about Heating & Cooling