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Solved: Dishwasher Making Noise When Off

Solved: Dishwasher Making Noise When Off

Your dishwasher will make noise when off due to the drain pump running all the time. This happens when the anti-flood device is activated.

When the device is activated, the dishwasher is always in drain mode; hence it doesn’t fill or circulate the water.

What is an anti-flood device?

This is a device that clears the dishwasher sump of water and also disables the filling valve circuits on the dishwasher.

The anti-flood device can be as simple as a float or as complicated as a unit activated by pressure or backpressure.

By cleaning the water, the anti-flood device ensures that the incoming water supply is stopped while reducing the water that escapes to the floor.

What would keep the anti-flood device activated all the time?

When the device is activated, the water must be getting back into the dishwasher tray and activating the switch. This can be brought about by plenty of factors, including:

  • A leaky valve that lets water into the system
  • Improperly routed drain line that allows water to get back into the dishwasher.
  • Obstructed one-way valve

How do you fix the problem?

Fixing the problem is simple—you need to identify the cause of the problem and fix it. You also should remove the water in the reservoir. To do this, you need to:

  1. Remove the kickback. This is the narrow wood piece that you find below the cupboard doors. It hides the area under the kitchen cupboards.
  2. Using a screwdriver, remove the screws holding the lower cover in place on the base of the dishwasher. If you aren’t used to it, it might seem hard, but it’s doable.
  3. After removing the screws, you should be able to see the lower part of the dishwasher. You also will be able to see and access the reservoir. Since the switch is activated, you will have water in the reservoir.
  4. Using a sponge or cloth, empty the water from the reservoir into a bucket. Depending on the amount of water in the reservoir, it might take you some time to empty all of the water.
  5. After you have removed all the water, the switch will move fully down. If it doesn’t, pull it down, so it sits on the plastic base.
  6. Once you are done, reattach the cover with the screws and replace the kickback.

If you had fixed the problem allowing water into the reservoir, the dishwasher should work as normal. If the problem doesn’t go away, contact a reputable contractor, and ask him to give the unit a look.

Other noises the dishwasher might be making.

Beeping: you will have this noise when you open the dishwasher mid-cycle, even when you are running a dry cycle. To stop the noise, you need to shut the door then hit start to allow the dishwasher to resume the cycle.

Booming noise: also known as water hammer, these noises come about due to problems with the household plumbing and water pressure problems.

As the dishwasher’s water valve closes, the water force in the pipes causes the pipes to rattle.

You can hear the force when you flush the toilet and turn off the faucet in the tub or sink. To fix the noises, contact a plumber and find out whether you can fix the problem.

Thumping: Rhythmic knocking sounds come about when the spray arm hits something inside the dishwasher as the spray arm rotates. To fix this problem, rearrange the dishwasher to provide clearance for the spray arms.

Rattling: As the dishwasher is running, the water action can cause the dishes to rattle and the lightweight plastic objects to get out of the rack.

Sometimes the noises come about due to the dishes and utensils not being secure and banging together, often due to improper loading.

In most cases, the noises are hard to distinguish from normal motor noises. To tell whether the noises are due to a loading problem, run the dishwasher without the dishes.

If you don’t have any noises, consult the dishwasher manual on proper loading.

Squealing: The noises are common when the dishwasher is new. Since it doesn’t have any water in it, it might make the noise the first time you are using it.

You also will have the problem when you run the appliance for the first time after a long time of inactivity.

To fix the issue, add one quart of water to the bottom of the tub. The water will lubricate the pump seal hence getting rid of the noise.

Grinding: The noises will happen when there is no water in the dishwasher, yet the circulation pump is running. To know more about this problem, visit: Solved: Dishwasher making Grinding Noise.

What should you do with a noisy dishwasher?

Most of the dishwasher problems are easy to fix, so you can fix them on your own. If you have tried fixing the issue, but it’s still growing, it’s time to hire a contractor.

For you to hire the right contractor, you need to consider plenty of factors that include:

Proper licensing

The last thing you want is working with an unlicensed professional. When the contractor is licensed, you are sure they will provide exceptional services.

Some states require their contractors to attend trainings to maintain their licenses. Hence, when you work with a licensed professional, you are sure they are well versed with the latest technical skills, so they understand how to fix even the current machines.


How long has the contractor been in business? The longer, the better as you are sure they have fixed many machines, so they have the necessary skills to diagnose the problem and fix it perfectly.


The biggest worry with homeowners is the amount of money they will spend fixing a problem, so the price charged by the contractor is vital. While this is the case, avoid a costly contractor as they might be ripping you off.

At the same time, avoid a contractor charging a meager price as they might be inexperienced hence end up damaging your appliance.

For best results, work with a contractor providing excellent services at an affordable price.


Reputable contractors will give a guarantee on the services they provide. Before you hire the contractors, ask them whether they stand behind their work by offering a guarantee. If they don’t, be wary of them.


Plenty of things can go wrong as the contractor is fixing your noisy dishwasher. The contractor can hurt himself; he can damage the appliance, among many other things.

Do you know what happens when an accident happens in your home? The liability is passed to you.

To avoid this, you should work with an insured contractor.

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