Why Is My Dishwasher Making Noise? Causes and Fixes

When your dishwasher is running smoothly, it’s one of the most convenient appliances in your home. However, when you notice a dishwasher making noise, it can quickly become a concern.

From loud banging to grinding or buzzing, unusual sounds may signal anything from minor issues to serious mechanical problems. Understanding what these noises mean can help you determine whether the fix is simple or if you need professional appliance repair.

Why Your Dishwasher Might Be Noisy

Every dishwasher makes some sound, especially during the wash and drain cycles. Water rushing through spray arms, detergent pods dissolving, and the motor running are all part of regular operation.

But when you hear a dishwasher making a loud noise that’s out of the ordinary, it’s time to investigate further. Unusual or excessive sounds are often early warning signs that something isn’t working correctly. Some common causes of unusual dishwasher sounds include:

• Loose or broken parts
• Worn-out bearings or motor issues
• Obstructions in the spray arm
• Improper installation or leveling
• Lack of regular cleaning and maintenance

The key is to identify the type of noise and when it occurs, as different sounds typically indicate specific problems and can help you determine whether a simple DIY fix or professional appliance repair is necessary.

Types of Dishwasher Noises and What They Mean

1. Grinding Noises

If you hear your dishwasher making a grinding noise, it may mean food debris is stuck in the chopper blade area. Many dishwashers use a chopper blade to break down leftover food particles before draining. When something harder, like a seed or a piece of glass, gets caught, you’ll hear grinding.

How to Fix:

• Turn off the dishwasher and unplug it from the power source.
• Remove the bottom rack and inspect around the drain area.
• Clear any debris and inspect the blade for damage.

If the noise persists, the pump assembly or motor bearings may be worn out, which could require professional appliance repair.

2. Loud Banging or Knocking

A dishwasher making loud noises, such as bangs or knocks, often means that something inside is moving around. Dishes that aren’t appropriately loaded can rattle or clash during the cycle. It can also point to loose or broken parts in the spray arm or water inlet valve.

How to Fix:

• Reload dishes so they don’t touch or overlap each other.
• Check the spray arms for cracks, obstructions, or wobbling.
• Tighten any loose screws or connections.

Regular inspection and dishwasher maintenance can help prevent these issues from returning.

3. Humming or Buzzing

A low hum is usually normal, as it can be the motor running or water being forced through the pump. However, if the buzzing is unusually loud, it may mean the motor is struggling, or an object is obstructing the impeller.

How to Fix:

• Listen carefully to where the noise originates.
• Check the bottom of the dishwasher for debris.
• If humming persists, schedule an inspection to determine if a motor replacement is necessary.

4. Squealing or High-Pitched Sounds

Squealing can come from worn-out motor bearings or a pump issue. Over time, these parts can wear down, creating high-pitched noises when they rotate.

How to Fix:

Unfortunately, this usually requires replacing the motor or pump. Since it involves complex parts, it’s best to call a technician for professional appliance repair.

5. Rattling or Vibrating

Rattling often indicates that water pressure is jostling silverware or other lightweight items. It can also indicate that the dishwasher isn’t level, causing it to vibrate against cabinets or flooring.

How to Fix:

• Make sure utensils are secured in the silverware basket.
• Check that the dishwasher sits evenly on the floor. Adjust the legs if needed.

This is one of the easiest unusual dishwasher sounds to fix at home.

Preventing Dishwasher Noises

The best way to avoid a dishwasher making noise is to focus on care and upkeep. Regular dishwasher maintenance can prolong the life of your appliance and reduce the need for costly repairs.

Here are some preventive steps:

• Regular cleaning: Wipe down spray arms, racks, and the door gasket to prevent buildup. Run a cleaning cycle with dishwasher cleaner or vinegar once a month.
• Check for obstructions: Before running a cycle, make sure nothing is blocking the spray arms.
• Inspect parts: Look for loose or broken components, such as screws, wheels, or clips, and tighten or replace them as needed.
• Load properly: Ensure dishes are secured and do not clash into each other.
• Schedule inspections: Even with DIY care, an annual check by a professional can catch issues early.

By making regular cleaning a habit and addressing minor issues right away, you can keep your dishwasher running quietly for years.

When to Call a Professional

While some noises can be fixed with quick DIY steps, others may signal larger issues, such as pump or motor failure. If your dishwasher continues to make grinding noises even after you’ve checked for debris, or if loud banging returns despite adjustments, it’s a good idea to call a professional appliance repair.

Ignoring the problem can lead to further damage, higher energy bills, or a complete breakdown. Investing in timely service can help you avoid premature appliance replacement.

Dishwasher Coverage with First American Home Warranty

With a home warranty from First American, you get peace of mind knowing that when your covered dishwasher breaks down due to normal wear and tear, we’ll help take care of the repair or replacement. Dishwasher coverage is included in all First American home warranty plans, so you’re protected no matter which plan you choose.

If your dishwasher suddenly starts making noise, stops draining, or won’t complete a cycle, a home warranty helps ensure you have reliable service and support without the stress of unexpected repair bills.

Protect Your Home Appliances Today

A dishwasher making noise is often a sign that something needs attention, as is the case with other essential home systems and appliances. Don’t wait until a breakdown catches you by surprise. Safeguard your home and budget with a First American home warranty. Explore your options and get a free quote today.

The contents of this article are provided for general guidance only. First American Home Warranty does not assume any responsibility for losses or damages as a result of using this information.

Please be aware that if you disassemble a covered system or item, it can invalidate your home warranty or manufacturer's warranty.