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Why Does My Furnace Make a Loud Noise When It Turns Off?

Posted On: September 30, 2013

Is your furnace making a loud noise when it turns off? Loud banging or thumping sounds after heating systems turn off is a common occurrence and it is usually nothing serious.

There are several things that can cause your furnace to make a loud banging or thumping sound when it turns off, but generally, the sound is caused by the sheet metal in your ductwork being bowed outward while the system is in operation and then contracting once the air is no longer being forced through.

This usually happens because your air filters are dirty or your registers (vents) are closed. When your air filters are dirty or your registers closed, air cannot flow through your ducts as quickly as it should, causing it to back up. This excess air causes the thin metal in your ductwork to bow outward and make a banging sound when it returns to normal.

While this issue is not serious, it does signify that you are either not utilizing your heating system as well as you could be due to closed vents or that you need new air filters.

If you have recently replaced your furnace filters and your registers are open, but you are still experiencing a loud noise when your furnace turns off, you may have a more serious problem that needs to be investigated by a heating repair technician.

To schedule furnace repair in the Scranton or Wilkes-Barre area, give us a call at (877) 591-7508 or contact us online

Reasons Your Furnace Is Making Loud Noises

What causes your furnace’s noise-making largely depends on the type of noise you’re experiencing. The following outlines the potential causes that could be contributing to your furnace’s noisiness according to the type of sound you’re hearing:

  • Scraping: This is typically caused by either a loose blower wheel, broken blower wheel, or broken motor mount.
  • Thumping: Thumping furnaces indicate that your blower wheel or motor is unbalanced.
  • Humming: If the furnace still functions correctly, the humming sound is most likely due to a loud transformer. However, persistent problems accompanied by humming indicate an issue with your interior fan or capacitor.
  • Squealing: This sound usually means your blower belt is insufficiently lubricated or that your fan belt may be loose.
  • Banging: Loud bangs can mean a number of things, including an undersized duct, closed vents, clogged filters, or bent sheet metal siding.
  • Rumbling: If you hear a rumbling sound, shut off your burner and contact your HVAC professional immediately! This can mean serious trouble if left unattended.

If you notice any of these sounds disrupting the peace in your home, be sure to contact a trusted HVAC professional for the service you need!

Benefits of Furnace Repair With T.E. Spall & Son

At T.E. Spall & Son, our team is dedicated to providing you with the fast, efficient furnace repair services you need to access continued comfort in your home. Our team is specially trained to use the industry’s most advanced tools and techniques to quickly identify the root cause of your furnace’s excess noise. When you choose our team for your furnace repair services, you’ll always receive the following:

  • Technical excellence from a team of regularly trained technicians
  • Flexible payment options for your convenience
  • Drug-free, background-screened employees committed to your safety and satisfaction

Don’t trust just any team with your furnace repair needs: Contact the team that’s proudly served Northeastern Pennsylvania for more than 20 years. Schedule your appointment with the team at T.E. Spall & Son by contacting us today!

Furnace Repair in Scranton, PA & Wilkes-Barre, PA

If you are in the Scranton, PA or Wilkes-Barre, PA area and are having problems with your furnace making a loud noise when it turns off, contact the furnace repair experts at T.E. Spall & Son today.

Contact us online or give us a call at (877) 591-7508 today to schedule furnace repair in Scranton, PA with the leading heating and cooling company in the northeastern Pennsylvania area.

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