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Furnace Noises that You Need to be Aware of

Furnace problems are among the most common home heating system issues in the country. This is because furnaces happen to be the most popular home heating systems. Though furnaces are actually no more prone to issues than any other system, the large number of people who own furnaces makes knowing about their repair needs a good idea. The most common indicator of a furnace problem is the emission of strange noises. Let’s take a look at some of the most common furnace noises that you need to be aware of.


Inside your furnace is a collection of parts known as the “air handler.” The air handler is what is responsible for actually circulating air around the house. It is normally comprised of two parts, the fan and the motor. The air handler motor is placed under an enormous amount of strain while the furnace is going, due to moving quite a bit of air over a fairly long distance. To help cope with this stress, air handler motors are equipped with lubricated bearings to lessen the amount of friction that they encounter. Unfortunately, these bearings can eventually lose their lubrication and dry out. This increases the amount of friction on the motor during operation, producing a loud grinding sound. If the bearings aren’t replaced the entire motor can overheat and burn itself out.


A loud booming sound coming from your furnace is often caused by a partially blocked burner. As the burner assembly burns fuel, it produces a number of waste materials as combustion byproducts. One of these byproducts is carbon. Carbon particles can slowly collect on the burner assembly, until the buildup actually hinders the part from igniting. When it finally does ignite, it burns through all the built up gas at once and creates a booming sound. If you hear anything that sounds like someone firing a canon in your basement, call a professional to have a look at your burner assembly.

If you’re hearing strange noises coming from your furnace, schedule an appointment with us today by calling Shavitz Heating and Air Conditioning. We provide quality furnace repair services in the Chicago, IL area.

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