3 Furnace Noises You Should Never Ignore

Furnaces—especially older models—often make noises. Normal sounds are minor pops from the ducts and the humming of the furnace as the blower runs.

But if the noises you’re hearing are loud enough to keep you up at night, your furnace needs repair or professional https://airprofessionalsnj.com/heating/furnace-maintenance/.

Ignoring these furnace sounds would be a big mistake since what’s causing them could lead to even more costly repairs (or even costlier replacement) later on. Here are three furnace noises you should never ignore, what’s causing them, and who to call for furnace repair in New Jersey.

Loud Scraping (Metal Rubbing Metal) Sound

A loud scraping noise that sounds like metal rubbing metal or nails scratching a chalkboard probably means something is wrong with the furnace’s blower wheel. If you hear this noise, turn off your furnace ASAP and call a professional for help.

Here are three problems with the blower wheel, from least serious to most serious, that are causing this noise:

  • The blower wheel came loose from the motor shaft and is now hitting the blower casing. If the wheel or shaft isn’t too damaged, a professional can easily tighten the wheel.
  • The blower wheel is broken and needs to be professionally replaced.
  • The motor mount broke, causing the whole blower assembly to drop and hit the housing.

Loud Bang or Pop When the Furnace Starts

Here are two common reasons for the loud banging or popping noises coming from your furnace:

  • Dirty furnace burners – the dirt on the furnace burners delay the burners from igniting, causing an excess of gas to build up. So when the gas does finally ignite, you’ll hear a loud bang. You should never ignore this noise because these small explosions could crack the heat exchanger (which is expensive to repair). Regular furnace maintenance can help prevent this issue before the heating season even starts.
  • Expanding and contracting air ducts – this is a common noise for homeowners with metal ducts. The ducts expand and contract as the blower turns off and on. This could be a sign of undersized ducts, closed vents, flimsy ducts, or a dirty filter. Clogged air filters can restrict your system.

Squealing or Whining Noise

A high-pitched squealing noise is caused by:

  • Loose, slipping, or fraying blower belt (should be adjusted by a technician or replaced if fraying)
  • Shaft bearings that need oil (a technician needs to apply lightweight oil to the lubrication port at each end of the shaft)
  • Malfunctioning blower motor (needs to be fixed or replaced)

This squealing or whining noise isn’t as big of a deal as the others listed above, but it’s best to get it fixed before it causes any further troubles inside your furnace. An annual furnace maintenance visit every fall can prevent the belt from getting too loose or certain parts from being under-lubricated.

Call a Professional to Make Sure

There are a variety of things that can go wrong with a gas furnace, so this is just a sampling of what could be causing noise and not a complete list. Even if the strange noise is minor right now, that does not mean you shouldn’t get it checked out because it could snowball into a much larger (and therefore costlier) problem later on. Furnace problems should not be ignored.

To prevent those costly problems, contact Air Professionals to help diagnose the heating system problem and fix it. All of our work comes with our 100 percent satisfaction guarantee!

We offer complete furnace services (including repair, maintenance, and replacement) to make sure your system is running energy efficiency.

Servicing throughout New Jersey, including:

Hunterdon County: Annandale, Asbury, Bloomsbury, Califon, Clinton, Flemington, Frenchtown, Glen Gardner, Hampton, High Bridge, Lambertville, Lebanon, Milford, Pittstown, Ringoes, Stockton, Three Bridges, and Whitehouse Station

Somerset County: Basking Ridge, Bedminster, Belle Mead, Bernardsville, Bound Brook, Branchburg, Bridgewater, Far Hills, Franklin Park, Gladstone, Green Brook, Hillsborough, Kingston, Martinsville, Millstone, Montgomery, Neshanic Station, North Plainfield, Peapack, Raritan, Rocky Hill, Skillman, Somerset, Somerville, South Bound Brook, and Warren

Mercer County: East Windsor, Ewing, Hamilton Township, Hopewell Township, Lawrence Township, Mercerville, Robbinsville, and West Windsor Township

Middlesex County: East Brunswick, Kendall Park, New Brunswick, Highland Park, Plainsboro Township, South Brunswick, and South Plainfield

Warren County: Alpha, Greenwich, Lopatcong Township, Phillipsburg, and Pohatcong Township

We're ready to help you!
Contact us today!

COVID-19 and HVAC System’s Shortages

HVAC Systems Shortages

COVID-19 has impacted many business and industries this year,  the HVAC industry included. Due to health and safety concerns, many…

Read More

Why is My Home Too Humid?

If you find yourself sticking to your faux leather couch this summer, you might have high levels of humidity in your home.

Read More

Top 3 Issues as a Result of High Indoor Humidity and Prevention Tips

As Summer arrives in New Jersey, temperatures start to rise. Unfortunately, this also means higher humidity levels for both the…

Read More

A Noisy Air Conditioner – Should You Be Worried?

We count on air conditioners to control the air temperatures in our space either at home or in the office.…

Read More

How To Get The Highest Efficiency From Your AC

ac monthly electricity bill

Those cool Summers in your home may be relaxing, all thanks to your reliable AC system.  But once you receive…

Read More