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Why Is My Dishwasher So Loud? 4 Quick Checks Before You Replace It

Most loud dishwashers have a knocking dish, a clogged filter, debris in the pump or an uneven stance. Check those four, then add insulation if it is still loud.

By Jamilur Rahman Updated November 5, 2026 · 6 min read

Time
30 min
Cost
$20-$50
Difficulty
Medium
A pulled-out dishwasher lower rack with a glass touching the spray arm in morning kitchen light
In this guide
  1. Quick answer
  2. Free vs. permanent fix
  3. What you'll need
  4. Why it happens
  5. Try this first (free)
  6. When free fixes aren't enough
  7. Buy the fix
  8. What each noise usually means
  9. What to skip
  10. FAQ
  11. Related problems

Quick answer

Why is my dishwasher so loud? Four things cause most of the noise: a dish or spray arm knocking, a clogged filter or object in the sump, a machine that is not level or touches the cabinet, and water-hammer in the supply pipes. Check them in that order. It takes about 30 minutes and costs nothing. If you have an older, thinly built dishwasher that works fine, a sound insulation blanket can soften what is left.

Free fix vs. permanent fix

Free fix · 30 minutes

Four quick checks

  • Reload so nothing touches the spray arms, and spin them by hand
  • Clean the filter and check for glass or debris
  • Level the machine and make sure it is not touching the cabinets
  • Listen to find out which part of the cycle is loud

How long it lasts: It fixes the noise for good when the cause is a loose dish, a clog or an uneven stance. It does not fix a worn pump or motor.

Most readers choose Permanent fix
Dishwasher sound insulation blanket (illustration)
Illustration

A dishwasher sound insulation blanket

On an older or thin-walled dishwasher, motor and water noise passes through the panels. A fitted blanket wraps the tub and absorbs part of it. It cannot fix a failing pump or a rattling dish, so do the checks first.

What to get: Dishwasher sound insulation blanket

How long it lasts: Years, since it sits around the tub and needs no upkeep.

Check price on Amazon

As an Amazon Associate I earn from qualifying purchases.

What you'll need

  • Flashlight

    To check the spray arms and the sump

    You have it

  • Rubber gloves

    For handling filter debris and any broken glass

    You have it

  • Small bubble level

    A phone level app works too

    You have it
  • Our pick
    Dishwasher sound insulation blanket (illustration)
    Illustration

    Dishwasher sound insulation blanket

    For a working but loud older dishwasher

    Check price

Why it happens

1

Dishes or utensils knocking

A cup, a pan handle or a utensil basket can block a spray arm. Light plastic items can flip and bang against the walls.

2

A clogged filter or an object in the sump

Food, glass shards, bones, seeds, labels or toothpicks in the sump make grinding and rattling as the pump runs.

3

A machine that is not level

A dishwasher that rocks, touches the cabinet or sits on loose brackets passes its vibration to the whole kitchen.

4

Water hammer

A thump or bang when water starts to fill is usually pipes in the wall shaking when the inlet valve snaps shut. It is the plumbing, not the machine.

5

An aging or low-end motor or pump

Older and budget machines hum louder, and worn bearings or seals start to squeal and grind.

Try this first (free)

Do these in order, starting with the simplest.

  1. Check 1: stop the dishes and arms from knocking

    Tool used: Flashlight

    Pull both racks and spin each spray arm by hand. It should turn freely. Rearrange so cups, pan handles and long utensils do not poke into the arms, and weigh down light plastic. Shine a light on the arms to look for chips or debris.

  2. Check 2: clean the filter and look for debris

    Tool used: Rubber gloves

    Turn the power off at the breaker or unplug it. Remove the lower rack, twist out the filter and wash it under running water with a soft brush. Shine a light into the sump and pick out glass, seeds, labels and toothpicks. Wear gloves and take care with glass.

  3. Check 3: level it and look for contact

    Tool used: Small bubble level

    Set a level on the tub floor or the door edge and check front to back and side to side. Adjust the front feet by hand or with a wrench, and check your manual for the rear adjustment. Make sure the tub is not touching the cabinet and that hoses are not rubbing pipes or walls. Tighten the mounting brackets under the counter.

  4. Check 4: find out when the noise happens

    Run a short cycle and listen. A thump when it starts to fill is water hammer, so make sure the shutoff valve under the sink is fully open, and a plumber can fix the pipes. A hum or grind during the wash points to the pump or debris. A rattle all through the cycle is a loose dish or arm.

When free fixes aren't enough

If grinding, loud humming or squealing continues after the checks, the circulation pump or motor may be worn, and repair or replacement is next. Ask a technician, and weigh the repair against the age of the machine. A common rule is to replace it if the repair costs about half the price of a new one. If the machine is just a loud, older model that cleans fine, a sound insulation blanket can take the edge off. It will not help a rattling dish, a failing pump or a water-hammer thump. Unplug it and call for service at any burning smell, leak or tripped breaker.

Buy the fix

Still stuck after the free fixes? These are the products we would look at.

Best pick
Dishwasher sound insulation blanket (illustration)
Illustration

Dishwasher sound insulation blanket

Fixes: leftover motor and water noise from an older dishwasher

Look for: Sized for your dishwasher's width and height; A heat-resistant material the maker lists; A fit that does not block hoses, wires or vents; Clear fitting instructions.

Who it's for
Someone with a working but loud dishwasher in an open kitchen or next to a bedroom.
Honest downside
Your dishwasher is new and already insulated, or under warranty, so check the manual first. Some makers advise against adding material around the tub. Skip it if the noise is a grind, a thump or a leak.
Check price on Amazon

As an Amazon Associate I earn from qualifying purchases. We don't show prices because they change, so use the button to see today's price.

How we picked: How we picked: this page is based on dishwasher maker manuals and troubleshooting guides, appliance repair advice, and the problems and fixes people report in reviews of sound insulation blankets. We do not test products by hand.

What each noise usually means

  • Rattle or clank: a loose dish, or a spray arm knocking.
  • Grinding or crunching: debris in the pump or sump.
  • A thump when the water starts: water hammer in the pipes.
  • A loud hum or buzz: the pump working hard, a blocked drain or a failing motor.
  • A squeal: worn seals or bearings.

What to skip

Replacing the machine before you check

A new dishwasher costs hundreds of dollars, and the noise is often a loose dish, a clogged filter or an uneven stance, which costs nothing to fix. Also skip pouring chemical cleaners into the sump to dissolve a blockage. Pick it out with your hands.

Frequently asked questions

How loud should a dishwasher be?
Newer quiet models are often rated in the low to mid 40s dBA, while older ones are often in the 50s or higher. The rating is in the spec sheet. A running dishwasher should be a low hum you can talk over.
Why is my dishwasher making a grinding noise?
Most often there is debris in the sump, such as glass, a bone or a seed. Check the filter and sump first. If it still grinds, the pump may be worn.
Why is my dishwasher suddenly so loud?
A sudden change usually has a simple cause: a dish blocking an arm, an item dropped in the sump, a clogged filter or a leveling foot that moved. Check those before you call for service.
Is it worth replacing a loud dishwasher?
If it cleans well and is under ten years old, check and repair it first. If it is old and the repair costs about half the price of a new one, replacement makes sense.

As an Amazon Associate I earn from qualifying purchases. Affiliate disclosure

Dishwasher sound insulation blanket (illustration)
Illustration

Our pick: Dishwasher sound insulation blanket

Check price