Troubleshooting Strange Furnace Noises and Sounds

Furnace maintenanceWhy is My Furnace Making Loud Noises?

It’s ordinary for a furnace to make some noise while it’s operating. But, what noises are good noises, and which ones are bad ones? It can often seem like a fine line, but there are some strange furnace noises you need to be on the look out for this winter. In this blog, Tin Man Heating & Cooling Inc. will run through the various squeals, booms, grinds, and thumps homeowners often hear from their furnace, and what those noises can sometimes mean.

Common Furnace Noises & What They Mean

The following noises indicate that there is something wrong with your system. If you hear any of these you should call for an emergency repair service:

  • Grinding - A furnace will make a grinding noise when there is a problem with the cage blower wheel. You should immediately turn off your furnace if you hear this noise. Operating the furnace when it is making this noise could result in damage to the heating system. The proper fix to the grinding noise depends on the type of issue. A professional HVAC technician needs to tighten the wheel in case it has become loose. Sometimes, the wheel becomes broken, in which case it must be replaced. Also, in case the motor mount is broken, you'll need to have it repaired.
  • Booming - Another sound that you may occasionally hear from your furnace is a booming sound. This sound most often occurs when the burner assembly becomes partially blocked. The blockage occurs due to the accumulation of carbon particles that are produced after the combustion of natural gas. The particles tend to accumulate inside the furnace in the assembly. If the particles are not removed from the furnace, the system ends up making booming noise. One of the best ways to avoid this is to schedule a regular, annual furnace tune-up.
  • Squealing - A furnace makes a squealing noise when there is a lot of friction in the moving parts. The noise mainly comes from the blower motor of the furnace. The squealing noise is produced when the parts rub together without enough lubrication. The primary causes of this problem are usually either unmaintained bearings or a worn-out belt, which will need to be replaced. Squealing noises aren’t just annoying. Over time, you can cause significant wear-and-tear to the moving parts of your furnace, leading to a furnace breakdown and a shortened system life.
  • Thumping - A thumping sound emanates from the furnace when the blower wheel of the furnace is unbalanced. The sound may seem similar to the noise washing machines make when wet clothes shuffle from side-to-side. In some cases, the sound emanates because the motor has become misaligned. This is a serious issue that must be resolved as soon as possible. While an out-of-balance motor or wheel will not be costly to repair, if the problem is left unresolved, it can turn out to be expensive.

Count on Tin Man Heating & Cooling Inc.!

When your furnace starts making strange sounds, don’t just ignore the problem. Doing so could mean that you’re risking a full system breakdown. Instead, call Tin Man Heating & Cooling for fast and effective furnace repair here in Bowling Green. Our experienced and friendly techs are ready to help you with your furnace questions and needs.


Call Tin Man Heating & Cooling Inc. at (419) 318-1214 or contact us online to schedule a furnace maintenance or repair service in Bowling Green!


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