Why Is My Air Compressor Humming?

Why Is My Air Compressor Humming?

An air compressor is a device that increases the pressure of air by reducing its volume and compressors are used in a variety of applications, including powering air tools, cleaning surfaces, or inflating tires. If your air compressor is humming, it may be caused by one of several issues which I will be discussing in detail, and what you can do about it. So, without any further ado let's take a look at it.

Reasons That May Cause Your Air Compressor To Start Humming:

An air compressor is a handy tool to have in the home garage. However, like any mechanical device, it can sometimes start to malfunction and one problem you may notice is that your air compressor starts to hum. This guide will explore some of the potential reasons that may cause your air compressor to start humming.

Not Enough Power Supply:

If an air compressor is not receiving enough power, it may start to hum. This is because the compressor is not able to build up enough pressure to keep the motor running smoothly and if this humming continues for more than a few seconds, it is likely that the air compressor will stall and will need to be restarted.

If your air compressor starts to hum, check to see if it is receiving enough power from the outlet or from the power source and if you are using an extension cord to power it then try using an extension cord that is suitable for it. Short extension cords are usually better than long ones because they don't introduce as much resistance and if you're using an extension cord, make sure it's rated for the amperage of your air compressor.

Defective Unloader Valve:

If your air compressor is humming it may be due to a defective unloader valve as the unloader valve is responsible for releasing the compressed air from the tank. If the unloader valve is defective, it may not release the compressed air properly, causing the compressor to make a humming noise.

To troubleshoot this problem, you need to turn off the air compressor and release all the pressure from the tank, and now turn on the air compressor. If the compressor starts running and there is still a humming sound then you likely have a faulty unloader valve then you need to either fix it or replace it with a new one.

Intake Filters Is Clogged:

Another reason for the air compressor humming may be due to clogged intake filters. These filters are designed to remove dirt and debris from the air before it enters the compressor and over time, they can become clogged with dust or other particles, which can make the compressor start humming.

First, try to remove the filter then run the air compressor if it runs without humming then it means the intake filter is clogged and you need to clean it. And If they are worn out too much then you may need to replace it.

The Tank Check Valve Is Blocked:

An air compressor that hums may have a partially or fully blocked tank check valve. To check if this is the problem, locate the valve and make sure that it's not obstructed and it is clean. Now try starting the air compressor again and if this doesn't solve the problem, then you may need to replace the valve.

Issues With The Pump:

The pump may have some mechanical issues which end up making a humming sound so for finding the pump check your user manual or contact the manufacturer to know more about it.

The Capacitor Is Faulty:

If your air compressor is humming, then it could be due to a faulty capacitor. The capacitor is responsible for providing power to the compressor motor and it may get damaged due to sudden high voltage so If you suspect your capacitor has failed, you'll need to replace it.


In the above guide, I have listed all the possibilities which can cause the air compressor to start humming and be sure to check all of them. But if you aren't still able to find the problem then I would recommend you to directly contact the manufacturer about it or let an expert check the air compressor. If you found this article helpful then kindly share it and have a nice day.

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