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

Loud noises coming from your furnace can be alarming, but it doesn't mean there is a huge problem. When you hear a banging noise, the problem can be simple to fix. Whether you need to replace a dirty filter or clean your ductwork, loud noises can be caused by a number of things. If you aren't comfortable trying to fix the problem on your own, it's time to call in a professional to service your furnace. Here are some things you can do to try and fix the problem yourself.

Change the Filter

There's a filter inside your furnace that can cause a banging sound when the furnace shuts off. A clogged filter can cause this problem, as well as a filter that is not properly in place. Extra air gets into the furnace and ductwork causing a banging sound when it shuts off.

The Ductwork Needs Cleaning

Similar to the air filter, if the ductwork is partially blocked, air won't be able to flow freely. Your ductwork should be professionally cleaned to help get rid of loud noises.

The Dampers Can be Adjusted

Your ductwork is sensitive to temperature changes, and expands and contracts when the system turns on and off. If you hear loud noises, try opening up a damper to see if that improves the air flow in your ductwork and gets rid of some of the noise.

Clean the Fan

A dirty fan can cause your furnace to make noises when it shuts off and on. The fan is inside the ductwork and should be cleaned if you hear sounds coming from your furnace. If your furnace is making loud noises, it may be time to call in the professionals. Contact the experts at Smoak’s today!