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Roadrunner Air Conditioning, Heating & Plumbing Blog

Why Your Furnace Is Making Strange Noises

If you have had your furnace for any real length of time, you are probably familiar with the kinds of noises that it commonly makes. So when it starts to make unusual noises it can be pretty alarming. There are all sorts of reasons why your furnace may start making unusual noises, none of them all that good. Let’s take a look at some of the more common noises your furnace might make, and the problems associated with them.


A deep booming sound is commonly caused by carbon particles collecting on the burner assembly. Over a long enough period of time, the carbon buildup can become bad enough that one or more of the assembly jets fires later than they should. When the jet finally does fire, it burns through the excess gas and creates the booming sound. If the assembly is not cleaned soon, the carbon buildup can eventually prevent the entire thing from igniting at all.


Your furnace air handler is the part responsible for circulating air through the house. This puts the system under quite a bit of stress, which it manages by being equipped with lubricated bearings. These bearings help keep the friction level down while the motor is running, but they don’t last forever. As the bearings start to wear down, the level of friction on the motor increases. Eventually, the motor will overheat and burn out if the bearings are not replaced. If you hear a grinding sound coming from your furnace, turn it off and call for repairs as soon as possible. It is far cheaper to replace the bearings on the motor than to replace the motor itself.

Call Roadrunner Air Conditioning, Heating & Refrigeration for full furnace repair services. We cover all of Las Vegas, NM.

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