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Smoak's Blog

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

11/2/2016

5 Comments

 
technician working on furnace
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!
5 Comments
Stefan Bradley link
7/29/2019 01:40:46 pm

It's good to know that your dampers might need to be adjusted if your furnace is making loud noises. My brother has noticed a loud sound coming from his basement, we think his furnace needs to be fixed. We'll see if we can find a repair service that can safely take care of his problem.

Reply
Michaela Hemsley link
2/19/2020 04:32:58 pm

Thanks for mentioning that if you hear a banging sound when you turn your furnace off it can be because you have a clogged filter. I was visiting my mom the other day and I noticed that her furnace was being pretty loud both when it turned off and when it turned on. Since neither I or my mother knows that much about furnaces, I think it would probably be smart to call an HVAC professional that can help us figure out if the filter is the problem or if it is something else, and get it fixed.

Reply
Greta James link
6/2/2020 02:45:10 pm

thank you for informing me that opening a damper can help to eliminate loud noises in the ductwork. There are loud noises in my home, but they seem to be coming from the furnace not the ductwork. For the last few weeks, these loud noises happen whenever the furnace turns on or off. I think it might be time to look into professional furnace repair services.

Reply
Zachary Tomlinson link
12/7/2020 10:48:06 pm

I was catching up with my cousin about his big move months ago, and now he is talking about how his heating system is making weird noises each time he's using them. After reading this article, I realized that this could be a sign that his unit needs cleaning. I'll be sure to recommend that he contact a heating system expert that can diagnose this for him.

Reply
Rebecca Gardner link
12/18/2020 01:47:10 pm

Thanks for explaining that the furnace's dampers may need to be adjusted. My sister said her furnace has been making a loud noise. I'll share this info so she can discuss it with an HVAC contractor soon.

Reply



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