Furnace Noises That Indicate a Problem

Furnaces make all kinds of noises during operation, most of which are fairly normal. If you’ve had your furnace for any length of time, you’re probably familiar with the kinds of noises that it makes while it’s operating. What if it suddenly starts making noises that you aren’t familiar with, though? Unusual furnace noises can indicate a problem that needs repair, so it’s best not to ignore them. Let’s take a look at some of those noises now.


The furnace makes use of a part called the air handler to circulate warm air throughout the house. In order to deal with the massive amount of friction that is generated during that process, the air handler motor is outfitted with a number of oiled bearings. As the bearings wear down over years, the friction on the motor increases and produces a grinding sound. If you hear this sound, you should call for repairs as soon as possible. Otherwise, the bearings could fail completely and the air handler motor could burn out.


If you’re using a natural gas furnace, as most people do, you may notice your system making a deep booming noise on startup. Don’t worry; your furnace isn’t going to explode. That sound is often made by a dirty burner assembly. As the burner assembly combusts carbon, the particles build up on the jets over time. Eventually, the carbon buildup can become extensive enough that it prevents one or more of the jets from firing on time. When the jets finally do ignite, they burn through a lot of built up natural gas at once and create that booming sound. Have the burner assembly professionally cleaned, and the problem should disappear.

Call Certified Air Systems for a full range of furnace repair services throughout Apopka, FL. We’ll make sure your system lives up to its potential. 

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