Dishwasher Making a Buzzing Noise? 6 Causes and Fixes

When your dishwasher is making a buzzing noise during a cycle, it's easy to worry that something is seriously wrong beneath the surface. This unsettling sound often points to an issue with the motor, pump, or another internal component that's struggling to work properly. At BlueStars Parts, we provide reliable dishwasher replacement parts to help DIY users identify faulty components, fix common dishwasher issues, and restore quieter, more consistent performance.

1. Is a buzzing dishwasher an urgent issue?

A buzzing dishwasher is not always an urgent issue. A brief, soft buzz during the drain phase can be normal, especially if it happens at the same point in every cycle. However, if the buzzing is loud, constant, or getting worse, it may mean the pump, motor, water inlet valve, or another part is under strain and should be checked soon.

Is It Urgent? Quick Assessment 

Inspect the dishwasher or schedule a repair if you also notice:

• The buzzing is loud, continuous, or getting worse.

• Dishes remain dirty or are not fully rinsed.

• The dishwasher does not fill or drain properly.

• The cycle stops before finishing.

A dishwasher making a loud, constant buzzing noise is urgent in situations (Source: Bluestars Parts) 

2. When does the dishwasher make a buzzing noise?

The timing of a buzzing sound is one of the most useful clues for narrowing down what's actually going wrong. A noise at the start of a cycle points to a different culprit than one that shows up only during draining. Here's a quick reference to help you match when you hear the buzz to what's likely causing it: 

3. Common causes of dishwasher buzzing noise

Once you know when the buzzing happens, it is easier to narrow down the part or area causing the noise. In many cases, the issue comes from debris, poor water flow, a struggling pump, or something loose inside the tub.

3.1. Blocked drain pump or stuck debris

The drain pump pushes dirty water out of the dishwasher. When food scraps, broken glass, labels, or small plastic pieces get stuck near the pump, the impeller may struggle to spin. This can cause a buzzing, humming, or grinding sound, especially during the drain cycle.

How to fix: Turn off power to the dishwasher. Remove the lower rack, take out the filter, rinse it clean, and inspect the sump or pump intake area for visible debris.

Before replacing the drain pump, check these areas first to avoid replacing a working part:

• Filter: Clean it thoroughly and make sure it is not restricting water flow.

• Sump: Remove food debris, seeds, broken glass, or other objects near the pump impeller.

• Drain hose: Check for kinks or clogs, especially near the sink or garbage disposal connection.

If the dishwasher still buzzes during draining or leaves standing water after these checks, the drain pump may be jammed, worn, or failing. If cleaning does not solve the issue, consider a compatible replacement drain pump:

• W10876537/W10724439 Dishwasher Drain Pump: Helps compatible Whirlpool, KitchenAid, and related dishwasher models move water out properly again when the original pump is jammed, worn, or no longer draining efficiently.

• W10348269 Dishwasher Drain Pump: A replacement option for compatible dishwasher models when the pump motor or impeller is damaged and cleaning no longer fixes the drainage issue.

Note: Check your dishwasher model number and confirm part compatibility before ordering.

W10876537/W10724439 Dishwasher Drain Pump and W10348269 Dishwasher Drain Pump (Source: Bluestars Parts) 

3.2. Malfunctioning water inlet valve

The water inlet valve controls the water entering the dishwasher at the start of a cycle. When the valve is clogged with mineral buildup, vibrating, or starting to fail, it may buzz, hum, squeal, or whistle while the dishwasher fills.

Quick Test: How to tell it's the inlet valve?

• Check the timing: The buzzing happens only when the dishwasher is supposed to be filling with water=

• The Dry Tub Test: Open the dishwasher door shortly after you hear the buzzing begin. The cycle will pause. If the tub is completely dry or the water level is unusually low despite the noise, the valve is likely struggling to open and let water in.

How to fix: Before replacing the valve, make sure the water supply valve is fully open, then check the inlet hose for kinks and the inlet screen for debris or mineral buildup. If water is reaching the dishwasher but the valve still buzzes, opens poorly, or restricts water flow, a replacement inlet valve can help restore steady water entry, improve filling performance, and reduce noisy operation during the fill stage.

You can consider these options based on your dishwasher model:

• W10327249/WPW10327249 Dishwasher Water Inlet Valve: Helps regulate water flow in compatible Whirlpool, KitchenAid, Kenmore, and related dishwasher models when the original valve is clogged, noisy, or no longer opening properly.

• 622058/00622058 Dishwasher Water Inlet Valve: A replacement option for compatible Bosch and related dishwasher models when the valve restricts water flow or creates buzzing during the fill stage.

• WD15X10014 Dishwasher Water Inlet Valve: Helps restore proper water entry in compatible GE dishwasher models when the original valve fails to open fully or becomes noisy while filling.

WD15X10014 Dishwasher Water Inlet Valve (Source: Bluestars Parts) 

3.3. Faulty wash motor or circulation pump

The wash motor, or circulation pump on many models, sends water through the spray arms during the wash cycle. If the motor bearings wear out, the impeller gets blocked, or the pump cannot spin freely, the dishwasher may buzz or hum without spraying water properly.

Typical symptoms:

• Weak spray: The water pressure is too low to spin the spray arms effectively.

• Dishes still dirty: Food residue remains on plates even after a full cycle.

• Buzzing during wash only: The noise occurs specifically when the machine is actively washing, not during filling or draining.

Try these checks first:

• Turn off power to the dishwasher.

• Clean the filter and remove any visible debris.

• Check the sump or impeller area if your model allows safe access.

• Watch for weak spray pressure, poor cleaning, or buzzing that continues during the wash cycle.

If the buzzing continues after these checks, the wash motor or circulation pump may be worn, seized, or electrically failing. Since this repair often requires internal access and electrical testing, it is better to call a technician unless you are comfortable working with appliance components.

3.4. Bad start capacitor or electrical humming

Some dishwasher motors use a start capacitor to help the motor begin running. If the capacitor weakens or fails, the motor may only hum or buzz instead of spinning. A similar sound can also happen when the motor shaft is seized, the coils are damaged, or the motor is receiving power but cannot engage.

Handle this carefully:

• Do not keep restarting the dishwasher if the motor only hums.

• Turn off power to the unit.

• Stop using the dishwasher until the capacitor, motor, and wiring can be checked.

• Call a qualified technician if the sound seems electrical or the motor will not start.

This is not a good area for trial-and-error DIY repair because it involves electrical components and proper testing tools.

3.5. Spray arm hitting dishes or loose parts

Not every buzzing noise comes from a failed part. Sometimes the sound is caused by tall utensils, lightweight plastic containers, loose items, or poorly loaded dishes touching the spray arm as it spins. This is one of the easiest dishwasher noises to fix and usually does not require any replacement parts.

Run a quick loading check:

• Spin the spray arms by hand before starting a cycle.
  

• Move tall plates, utensils, and cookware away from the spray arms.

• Secure lightweight plastic items on the top rack.

• Make sure no loose parts are vibrating inside the tub.

• Check that the dishwasher is level and not pressed tightly against nearby cabinets or countertops.

If the noise stops after reloading or leveling the unit, no replacement part is usually needed.

Dishes that aren't stacked properly can rub against the spray arm (Source: Bluestars Parts) 

3.6. Clogged filter or food debris near the pump

Food particles, labels, seeds, and small plastic pieces can collect in the filter, sump, or pump intake area. When water cannot move freely through these areas, the pump has to work harder and may start buzzing or humming.

Clean the filter area:

• Remove the lower rack.

• Take out the filter assembly.

• Rinse the filter under running water.

• Clear visible debris from the sump and pump intake area.

• Check your owner’s manual if the filter feels stuck or you are unsure how to remove it.

In many cases, this simple cleaning step is enough to help water circulate and drain better without replacing any parts.

Maintenance Tip: Cleaning the filter every few weeks helps prevent many drainage-related buzzing noises and keeps your dishwasher running efficiently. 

4. When to call a technician

Many buzzing issues can be fixed with basic cleaning, but some repairs involve electrical risks or require deeper disassembly. Use the table below to decide whether the issue is suitable for DIY repair.

Stop DIY troubleshooting and call a technician if:

• Buzzing continues after cleaning the filter and sump.

• The dishwasher buzzes but does not drain.

• The dishwasher buzzes while filling, but no water enters.

• The motor hums but does not start.

• The dishwasher stops mid-cycle or trips the breaker.

When you've confirmed which part is behind the buzzing but the problem falls outside these more serious cases above, replacing the specific component yourself is often the most cost-effective fix. Browse more BlueStars dishwasher replacement parts here if you've identified a specific component that needs replacing.  

Dishwasher Buzzing: Quick Decision Guide

Use the timing of the buzzing noise to identify what to check first.

5. FAQs

5.1. Is a noisy dishwasher an urgent issue?

Not always. A soft hum can be normal, but loud, repeated, or worsening buzzing may indicate a clogged pump, damaged impeller, or failing motor. Check the dishwasher if the noise comes with poor cleaning or drainage problems.

5.2. Why is my dishwasher buzzing but not draining?

The most likely causes are a clogged filter, blocked drain hose, or jammed drain pump. Clean these areas first and check for debris near the pump impeller.

5.3. How do you fix a noisy dishwasher?

Identify when the noise occurs, then check the spray arms, filter, drain pump, and loose dishes. If the buzzing continues or involves the motor or electrical components, call a technician.

5.4. How loud is too loud for a dishwasher?

A sudden increase in noise is more important than the exact decibel level. Loud grinding, scraping, or continuous buzzing that can be heard from another room usually indicates a problem.

5.5. Why does my dishwasher sound like it’s buzzing?

A brief buzz may be part of normal filling or draining. Loud or persistent buzzing often points to trapped debris, a clogged pump, a faulty inlet valve, or a worn circulation motor.

5.6 Why does my dishwasher buzz but still work?

A low buzz can be normal while the pumps are running. If it becomes louder, clean the filter and check the pump area for food debris, broken glass, or other obstructions.

If your dishwasher is making a buzzing noise, don't ignore the warning signs. Diagnosing the source of the noise early can help prevent costly repairs and keep your dishwasher running efficiently. When it's time to replace faulty parts, Bluestars Parts offers high-quality, reliable replacement components that make DIY repairs easier and help restore your appliance's performance with confidence.

Contact information:

8 The Green, Ste A, Dover, Delaware 19901-3618, United States

Website: https://bluestarsparts.com/