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Solved: Whirlpool Dishwasher Making Loud Humming Noise

It’s normal for most dishwashers, including whirlpool dishwashers, to make some humming noises when they are running, but if the noises are more than 65 dB, they become too loud and a nuisance.

Is your Whirlpool dishwasher making loud humming noises? Here are some of the reasons for this and what you should do about it:

Chopper assembly issues

If the humming noises come about during a cycle, the main culprit is the chopper assembly. Different chopper assembly problems will cause humming noises.

dishwasher whirlpool

For example, the dishwasher will make humming noises if the chopper assembly is dirty, improperly installed, or broken.

If you are a dab hand at DIY projects, you can open up your dishwasher to access the chopper assembly, but if you aren’t confident in your skills, let a professional help you out.

If you want to go at it alone, here is a detailed guide on how to do it:

When you access the chopper assembly, carefully inspect it and confirm there isn’t something jamming it and preventing it from running. Also, check the sump basin and confirm there isn’t something jamming up the chopper blade.

Of course, remove the clogging material if present.

If your chopper is broken or worn out, replace it immediately.

Faulty ventilating fan

Is your Whirlpool dishwasher making the humming noises during a drying cycle? The problem might be with the ventilation fan.

Many dishwashers use the vent to release hot, steamy air that dries the dishes. If the vent is faulty or clogged hence not opening correctly, it makes humming noises, and since it’s not releasing enough hot air, it doesn’t dry the dishes, so you always have moisture on your dishes.

You should inspect your dishwasher vents and if there are any clogging materials there, remove there. You also should consider replacing the vents if they are faulty.

To help you out, here is a video explaining how to replace a faulty air vent:

While at it, inspect the fan motor and confirm it’s running correctly. It’s also wise to consult the dishwasher manual for instructions on testing the motor. If it’s not working correctly, find a replacement.

Faulty wash pump motor

The wash pump motor spins the wash pump impeller under the dishwasher tub. Besides the defective wash pump motor decreasing the spray pressure, it also leads to a high-pitched humming noise, not to mention failing to clean the dishes as well as it should.

You should test and inspect the motor and replace it if defective. For the best outcome, replace all the wash pump motor parts, including the water seals.


I hate noise with every single bone in my body and I'm here to share some of the tricks that have worked for me in my effort to keep off noises from noisy neighbors, noisy appliances, and so on. Buckle up for the ride.

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