If you’ve ever paused mid-conversation because your dishwasher suddenly made a strange noise, you’re not alone. Dishwashers aren’t silent machines, but the challenge for most homeowners is knowing which sounds are normal and which ones signal a problem.
Some noises are part of everyday operation. Others are early warnings that something isn’t working as it should. Understanding the difference can save you stress, prevent unnecessary service calls, and in some cases help you avoid costly repairs down the line.
This guide breaks down the most common dishwasher sounds you’ll hear, explains what causes them, and shows you when it’s time to take action.
Normal dishwasher sounds include gentle humming, water swishing, and brief clicking during cycle changes.
Grinding, loud buzzing, squealing, or sudden knocking noises aren’t normal and often indicate debris, loading issues, or mechanical problems that should be checked before further use.
Dishwasher noise is usually discussed in A-weighted decibels (dBA). Because the decibel scale is logarithmic, relatively small numerical changes can represent meaningful changes in sound energy. For background on dBA measurement and the logarithmic scale, see the CDC/NIOSH guidance on noise and hearing. If your priority is a quieter replacement rather than troubleshooting an unusual sound, compare our quietest dishwasher guide and our open-plan kitchen guide.
Why Dishwashers Make Noise in the First Place
A dishwasher is a combination of moving water, mechanical parts, and electrical components. During a typical cycle, it fills with water, sprays it at high pressure, drains it, and repeats this process several times. Each stage comes with its own sounds.
Modern dishwashers—especially newer, quieter models—are designed to minimize noise, but “quiet” doesn’t mean silent. If you’re shopping for a new unit, start with our dishwasher buying guide to understand key noise ratings and features.
The key is recognizing patterns. A sound that happens briefly at the same point in every cycle is often expected. A new, loud, or irregular noise usually deserves attention.
Normal Dishwasher Sounds You Shouldn’t Worry About
Low Humming or Soft Whirring
A gentle humming sound is one of the most common and harmless dishwasher noises. It usually comes from the circulation pump pushing water through the spray arms.
If the hum is steady and consistent, it’s a sign the dishwasher is doing exactly what it’s supposed to do.
Light Sloshing or Swishing Water Sounds
Hearing water move inside the dishwasher is normal, especially during wash and rinse phases. This sound indicates that water is being sprayed and redirected around the tub.
In fact, if you don’t hear water movement at all, that can sometimes be more concerning than hearing it.
Clicking or Ticking
Short clicking sounds often come from:
- The detergent dispenser opening
- Valves switching on and off
- Control relays during cycle transitions
These clicks are brief and predictable. As long as they don’t repeat continuously, they’re generally nothing to worry about.
Draining Sounds
A brief gurgling or whooshing sound near the end of a cycle usually means water is being pumped out. This is normal and should only last a short time.
Dishwasher Sounds That May Signal a Problem
Loud Grinding or Growling
Grinding noises are not normal and often indicate that something is interfering with the pump or spray arms. Common causes include:
- Small food particles
- Broken glass
- Hard debris caught in the filter or pump
If you hear grinding, stop the cycle and inspect the filter area as soon as possible.
Repetitive Knocking or Banging
A knocking sound that repeats during washing is often caused by dishes or utensils hitting the spray arms. This is usually a loading issue rather than a mechanical failure.
However, if the knocking continues even with an empty or lightly loaded dishwasher, it could point to a loose internal component.
High-Pitched Squealing
Squealing noises can be a sign of:
- A worn pump bearing
- A struggling motor
- Insufficient water flow
These sounds often start quietly and get worse over time. If left unaddressed, they can lead to more serious mechanical problems.
Loud Buzzing or Electrical Humming
A loud, persistent buzzing sound—especially if accompanied by poor performance—may indicate an electrical issue or a failing motor. This is one sound you shouldn’t ignore.
If the dishwasher stops mid-cycle or trips a breaker, professional inspection is recommended.
When Dishwasher Noises Change Suddenly
One of the most important warning signs isn’t a specific noise, but a change in sound. If your dishwasher suddenly becomes louder or starts making unfamiliar noises, it’s worth investigating—even if the machine still runs.
Sudden changes often indicate:
- A clogged filter
- A failing pump
- Loose internal parts
- Improper loading habits
Catching these early can prevent long-term damage.
How to Troubleshoot Noisy Dishwasher Sounds
Before calling for service, there are a few practical steps you can take:
- Check the filter
Remove and clean the dishwasher filter. Debris buildup is a common cause of noise and poor water flow. - Inspect the spray arms
Make sure they spin freely and aren’t hitting dishes or utensils. - Review how the dishwasher is loaded
Overcrowding or poorly placed items can cause knocking or rattling. - Run an empty cycle
If the noise disappears, the issue is likely related to loading rather than the machine itself.
These simple checks solve a surprising number of noise-related complaints.
Are Quiet Dishwashers Completely Silent?
No dishwasher is completely silent—not even premium quiet dishwashers. What changes is the quality and tone of the sound.
Instead of loud splashing or mechanical noise, quieter dishwashers tend to produce:
- Soft water movement
- Low hums
- Occasional clicks
If a dishwasher marketed as “quiet” suddenly produces harsh or irregular noises, that’s usually a sign something needs attention.
When to Call a Professional
You should consider professional help if:
- The noise is loud, metallic, or grinding
- The dishwasher isn’t cleaning properly
- The noise is getting worse with each cycle
- There are electrical issues or error codes
Ignoring persistent abnormal sounds can turn a minor repair into a major replacement.
Final Thoughts: Trust the Pattern, Not the Volume
Dishwasher noise isn’t just about how loud it is—it’s about how it behaves over time. A consistent, predictable sound is usually normal. Sudden, irregular, or aggressive noises aren’t.
Learning to recognize what your dishwasher normally sounds like is one of the simplest ways to protect it. When something changes, your ears are often the first warning system.
For long-term performance and to prevent future issues, follow a simple routine on how to maintain your dishwasher monthly.
Smart Tip
If you’re unsure whether a sound is normal, listen for consistency. Sounds that repeat at the same point in every cycle are usually part of normal operation. Random or worsening noises deserve a closer look.
Dishwasher Noise FAQs
Q1: Is it normal for a dishwasher to make noise during a cycle?
A: Yes. Humming, water movement, and brief clicks are normal during washing and draining phases.
Q2: Why is my dishwasher making a grinding noise?
A: Grinding usually means debris or broken glass is caught in the filter or pump and should be removed immediately.
Q3: Can a noisy dishwasher still clean properly?
A: Sometimes, but abnormal noises often signal issues that can reduce cleaning performance over time.
Q4: When should I stop using a noisy dishwasher?
A: If you hear grinding, loud buzzing, or squealing that worsens, stop the cycle and inspect or call a professional.
