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Your Furnace is Knocking… And it Shouldn’t be

That’s Your Furnace Knocking

While your furnace may be working as intended, if it has started to make new sounds and loud noises, that is usually an indication that something is about to go wrong.

Your Western New York furnace has been put to the test so far this winter and there is only more to come. Now is not the time to ignore issues with your furnace or leave them unresolved. If you have noticed new sounds coming from your furnace, pay attention to them. If your furnace is knocking, it shouldn’t be.

Let’s review some possible reasons for your furnace knocking, so that you can be aware and avoid being without heat the rest of the winter

Is Your Furnace Knocking?

While your furnace may be working as intended, if it has started to make new sounds and loud noises, that is usually an indication that something is about to go wrong. Typically, when your furnace starts to make new sounds, especially a knocking or banging noise, this is a sign that something is not right.

If the knocking sound occurs only when your furnace first starts or right after it stops blowing hot air, the noise probably is caused by expansion and contraction and it not an indication of a problem; however, if the knocking continues as the furnace is running, there is likely an issue.

Let’s take a deeper look at why your furnace may be knocking:

Parts Going Bad: Furnaces are complex parts of your Western New York home, and like all things in your home, they age over time. There are signs that you need a new furnace, one of those being new noises. There are various parts and pieces of your furnace that can go bad and cause it to produce a knocking noise as it functions.

Dirty Furnace Burners: Dirty furnace burners can cause your furnace not to ignite properly and can produce a buildup that will create the knocking noise. This is basically a mini-explosion in the furnace, as the furnace is not able to function as it should. This issue needs to be addressed as soon as possible to avoid more expensive repairs. One of the many benefits of an annual furnace tune-up is that these parts are checked and cleaned as needed to prevent issues.

Problems with Ductwork: If your HVAC system is making observable new loud noises when running, there could be an issue with your ducts. Rattling, vibrating, knocking/banging, or whistling sounds usually mean that your ductwork has something loose, a hole, disconnected joints, amongst other things. If your furnace sounds like someone knocking at your door, there could be problems with your ductwork.

There are many reasons that your furnace can produce knocking sounds, and regardless what the cause, it is something that needs to be addressed. Your furnace should not sound like the pizza delivery person outside of your door, and when it does, it is a sign that you may soon be without heat, have higher energy bills, amongst other things.

Duffett Plumbing, Heating & AC is your team for heating repair, maintenance, and installation services here in Hamburg and Erie County.

When your heater quits on you, contact us for 24/7 heating repair. No matter what type of heating system—furnace, boiler, ductless, or hybrid unit—your home has, our technicians can get it running again.

We’re proud to offer these heating services in Hamburg, NY: Heating Repair, Heating Tune-Up, New Heating Systems.