Because the heat exchanger is made out of metal, as it is heated cracks will expand/contract, and can cause rattling, popping, and/or banging noises. If you have a crack in the heat exchanger, you are likely to hear a rattling noise as your thermostat turns on the heat. Remember: blue is normal, orange or yellow is not.Īudible Sounds. In most furnaces, you can see the flame that heats your air. If you find corrosion or cracks in other components of your furnace, such as the draft diverter box or inducer motor, call us immediately.Ĭhange in the flame appearance.
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White soot build-up in or around the burners of your furnace.Ĭorrosion & Cracks.
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A malfunctioning heat exchanger will often create an unpleasant and strong odor that smells similar to formaldehyde.
#Lennox furnace parts heat exchanger cracked#
Six Signs Your Furnace Heat Exchanger May be Cracked If there's a crack in one of the cells of the heat exchanger, the gases being burned – carbon monoxide, sulfur dioxide, nitrous oxide – could leak into your home, causing illness or, in extreme cases, death. To help prolong the life of your furnace, schedule yearly inspections and change your air filters annually, at minimum.Ī cracked heat exchanger poses a serious threat to the safety of your home. Manufacturers recommend a service life of a gas furnace to be between 15-20 years. Over a span of time, this will simply cause the metal to fatigue and crack. Heat exchangers, made of metal, go through continuous expansion (as it heats up) and contraction (as it cools). However, the most common reason that a heat exchanger will crack is just normal wear and tear. An over-sized furnace can also cause overheating and crack the heat exchanger. A clogged air filter restricts airflow through the furnace and overheats the heat exchanger, which eventually results in stress cracks.Īlso, it is important that your furnace is sized appropriately for your home. A common reason your heat exchanger will fail can simply be a dirty, clogged air filter.