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Is Your Furnace On the Fritz? 4 Sounds That Scream Yes!

Furnaces are an efficient way to stave off the cold winter nights in Mansfield, TX. A typical furnace has a lifespan of about 20 years. Around this time, you might start to notice unusual sounds when it performs a heating cycle. If you hear any of these four sounds coming from your heating system, it’s important to have a trained service technician take a look at it:


An off-balance motor or blower wheel could cause a thumping sound during heating cycles. If you don’t correct this problem, it could cause the motor to overheat. A blown motor will stop your heating system from completing heating cycles.


There are several possible causes of squealing sounds coming from your furnace. A belt may have come loose, or it may be thread-bare. One of the shaft bearings may have lost lubrication or slipped out of place. The blower’s motor could be malfunctioning. All of these issues require professional attention.

Metal Scraping

If you hear a sound similar to fingernails on a chalkboard, your heating system is on the fritz. This sound usually results from metal scraping against metal. The blower motor may have loose or damaged parts, or it could be off-balance.


If you hear a loud humming sound when your furnace starts, this could be due to an electrical problem. The blower motor draws a lot of electricity to start working. This initial large draw of power could be stressing your home’s wiring. The capacitor or fan could also be failing.

A malfunctioning furnace in your Mansfield, TX, home can be a serious health and safety risk. By listening for these unusual sounds, you’ll know to arrange for a service visit as soon as possible. Prompt repairs of heating system problems save you money and keep your home and family safe and healthy. At Airmasters AC, Heat, Plumbing & Electrical, we’re proud to provide affordable heating system repairs and a 100% satisfaction guarantee.

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