What Is That Loud Knocking Sound Coming From My AC?

What Is That Loud Knocking Sound Coming From My AC?


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What Is That Loud Knocking Sound Coming From My AC?

Do you hear a loud banging or knocking sound coming from your air conditioner? This could be a sign that something is wrong with your AC. It could be an issue with the fan or motor, or even with the air ducts. To make sure your AC is working properly, you should call a professional who can take a look and fix the problem.

The most common causes of a loud knocking or banging noise are:

Do you hear a loud knocking or banging sound coming from your air conditioner? It could mean that a part of your AC compressor is loose. The compressor is the part that is outside your house. It could be the crankshaft, connecting rod, or piston pin that needs to be tightened or replaced. Or, the blower, which is like a fan inside your house, might be unbalanced and causing the noise. Finally, it could be that the compressor itself is loose or that parts inside the blower are hitting each other. If you notice any of these problems, you should call a professional to fix them.

Other Causes of Knocking Sounds in AC

Sometimes, an AC can make a knocking sound for reasons other than a loose part. These can include.

Pipes that are too small. If the pipes that lead to and from the AC unit are too small, the air may struggle to move through them. This can cause a knocking sound.

Dirty AC filter. If the filter of your AC unit is dirty, it can restrict the flow of air, causing a knocking sound.

Low pressure. Low pressure in the AC line can also cause a knocking sound.

What should I do if my AC is making knocking noises?

If your AC is making knocking noises, you should call a professional to take a look and see what the problem is. It is important to get the AC checked out by a qualified person so that the problem can be fixed.

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Stephanie Hampton
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Alien AC has been amazing since our move to Arizona. They installed a whole new unit in our upstairs, repaired the unit downstairs, and when our heat went out this morning, they talked me through how to re-program our thermostat over the phone. Pricing has been upfront, clear, and fair. Chris and the guys are great to work with. Customer service is just great! Definitely go with them if you need HVAC work done.

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I have been using ALIEN for 35+ years & 4 Residences. In ALL Installs & Annual Service Check Ups, I would Rate ALIEN 10 Stars+ What sets ALIEN Apart is: -You will ALWAYS get a Fair Price On the AC Unit & Quality Install. -Chris Anderson takes the Time to Fully Listen to Your Needs & then fully explains in Detail the Best AC Options. -Mike Anderson’s team’s thoroughness in the AC Install process is 2nd to None. They will make sure when the Install is complete, You will know how & be comfortable with how to operate the New AC Unit & the Thermostat. Thanks again, ALIEN. You are the BEST!!!

Susan Edwards
We have every construction company in our home, from windows to re-models to plumbers to flooring, you name it we’ve had them. I have to say to date Alien Air Conditioning & heating is by far the best. Manners, respect, professionalism none like them. They are the best! I would recommend them to anyone who needs AC work done. Services: HVAC duct & vent installation, Ductless heating & A/C services, HVAC duct & vent repair

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