Why Is My Dishwasher Making a Buzzing Noise: Troubleshooting and Solutions

When you turn on your dishwasher, you expect to hear the gentle hum of water spraying and dishes getting clean. However, if you’re greeted with an unexpected buzzing noise instead, it can be concerning. A buzzing dishwasher can be indicative of various issues that require attention. In this article, we’ll explore the reasons behind this buzzing noise and guide you through troubleshooting steps and solutions to get your dishwasher back to its peaceful and efficient operation.

Understanding the Buzzing Noise

When your dishwasher emits a buzzing sound, it’s important to pay attention to the specific nature of the noise. Is it a continuous buzz, or does it come and go? Does it occur during specific cycles, such as when the water is supposed to be spraying or when the drain pump is active? Understanding the timing and pattern of the noise can provide valuable clues about its source.

Common Causes of Buzzing in Dishwashers

Electrical Malfunction

An electrical issue within the dishwasher’s control panel or wiring can lead to buzzing noises. Loose connections, damaged wires, or faulty components may cause electrical disruptions that manifest as buzzing.

Clogged Water Inlet Valve

A buzzing noise during the fill cycle could be due to a clogged water inlet valve. If sediment or debris accumulates in the valve, it may struggle to open fully, resulting in a buzzing sound.

Faulty Pump Motor

The pump motor is a critical component responsible for spraying water and draining it out. A malfunctioning pump motor can produce buzzing noises, especially if it’s struggling to operate.

Worn Out Bearings

Dishwasher spray arms and other moving parts are equipped with bearings to reduce friction. Over time, these bearings can wear out, leading to unusual noises during operation.

Defective Solenoid

Solenoids control the flow of water and detergent into different compartments of the dishwasher. If a solenoid is defective, it might produce buzzing sounds as it struggles to function properly.

Troubleshooting and Solutions

Checking for Foreign Objects

Inspect the dishwasher’s interior for any foreign objects like small utensils or broken glass that might be causing a buzzing noise. These objects could be obstructing the spray arm’s movement or interfering with other components.

Inspecting the Water Inlet Valve

If you suspect a clogged water inlet valve, turn off the dishwasher’s power and water supply before examining the valve. Clean it thoroughly to remove any blockages and restore proper water flow.

Examining the Pump Motor

To address a faulty pump motor, start by checking if any obstructions are hindering its movement. If no obstructions are found, the pump motor might need to be repaired or replaced by a professional.

Replacing Worn Bearings

If worn bearings are the culprit, you’ll need to disassemble the spray arms and inspect the bearings. If they’re indeed worn out, replace them to eliminate the buzzing noise.

Testing the Solenoid

Testing a solenoid requires a multimeter to check for proper electrical continuity. If the solenoid fails the test, it’s best to replace it to prevent further issues.

Maintenance Tips for a Quieter Dishwasher

Regular Cleaning

Periodically clean the dishwasher’s interior, including the filter, spray arms, and door seals. Removing debris and buildup can prevent unnecessary noise.

Proper Loading of Dishes

Avoid overcrowding the dishwasher, as it can obstruct the spray arms and lead to noisy operation. Follow the manufacturer’s guidelines for proper loading.

Using the Right Detergent

Using the correct dishwasher detergent can make a significant difference in noise levels. Choose a detergent that’s recommended for your dishwasher model.

Maintaining Seals and Gaskets

Inspect and replace any damaged door seals or gaskets. Proper sealing is essential for noise reduction and efficient operation.

When to Seek Professional Help

If your troubleshooting efforts don’t resolve the buzzing noise, or if you’re uncomfortable performing extensive repairs, it’s time to call in a professional dishwasher technician. They have the expertise to diagnose and fix complex issues.


A buzzing noise from your dishwasher can be frustrating, but with the right troubleshooting steps and maintenance practices, you can identify and resolve the underlying problems. Regular cleaning, careful loading, and prompt attention to unusual sounds can keep your dishwasher running smoothly and quietly.


Why is my dishwasher making a buzzing noise during the wash cycle?

If your dishwasher is buzzing during the wash cycle, it could be due to issues with the pump motor, water inlet valve, or solenoid. Check for obstructions and consider professional help if needed.

Is a buzzing noise always a sign of a major problem?

Not necessarily. Sometimes, a simple obstruction or minor electrical issue can cause buzzing. However, it’s important to investigate the source of the noise to rule out any significant problems.

Can I repair the pump motor myself?

While some basic troubleshooting can be done by homeowners, pump motor repairs can be complex. It’s often best to rely on a professional technician to avoid causing further damage.

How often should I clean my dishwasher?

Aim for at least once a month. Regular cleaning prevents buildup that can lead to noise and efficiency issues.

What should I do if the buzzing noise persists after cleaning?

If the noise continues, it’s advisable to contact a professional technician. Ongoing buzzing might indicate a deeper problem that requires expert attention.

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