Free Estimates For Installs Only: 815.695.5828

Quality Craftsmanship & Service at Competitive Prices

Why is my Furnace Making Loud Noises?

Why is my Furnace Making Loud Noises?

Loud noises coming from your furnace are not normal. Your furnace can’t tell you what is wrong but when itstarts making a noise, it’s best to listen and contacta professional HVAC contractor to come out and inspect your furnace.

Here are some possibilities or reasons for loud noises coming from your furnace:

  • Dirty burners.  This is a common culprit especially if you haven’t had Annual Furnace Maintenance performed on your unit.  The furnace will make a low-pitched rumbling or growling noise when the burners are dirty.
  • Adjustment to the Pilot Light.  If you have an older furnace with a pilot light, it will also make a low-pitched noise which will sound similar to having dirty burners when the pilot light needs to be adjusted.
  • Blower Belt Slipping.  If you have an older furnace that operates with a blower belt, the belt can slip and start to make a loud noise.  The sound will often sound like a high pitched squeal.
  • Lack of Lubrication.  This is another indication of a furnace needing a Furnace Clean and Safety Check (annual furnace maintenance).  Without proper lubrication, the friction between your blower’s bearings can make a high-pitched noise similar to the blower belt slipping.
  • More Serious Problems.  It’s never a good sign to hear loud noises coming from your furnace.  Although they can often be simple problems that I stated above, they can also occur when you have a very serious problem like a gas leak or a cracked heat exchanger (shown in the picture above).  These can pose serious safety threats to your family and home.

What to do when you hear a noise coming from your furnace

When you hear a noise coming from your furnace it’s best for you to be on the safe side and call Aries Mechanical at 815-695-5828.  The noise could range from something simple as dirty burners to a more serious problem as having a cracked heat exchanger.  A cracked heat exchanger, for those of you who don’t know, could allow exhaust gas from the furnace to contaminate the household air with carbon monoxide.

Many of the problems associated with your furnace making loud noises can be prevented with a Preventative Maintenance Agreement.  During the annual maintenance your furnace will be cleaned, lubricated and inspected for any safety problems, which is likely to prevent any low-pitched rumbling or high pitched squealing noises down the road.

If you would like your heating system cleaned and inspected or need an estimate for an installation, contact Aries Mechanical by calling us at 815-695-5828 or click on the link and it will connect you to our “Contacts” page of our website where you can fill out the form and submit.

<< Return to previous page