Dishwasher Making Loud Noise During Cycle? What to Check

Why Your Dishwasher Sounds Like a Rock Tumbler

A dishwasher that grinds, buzzes, or rattles during its cycle isn’t just annoying—it’s usually telling you something needs attention. While some operational noise is normal, loud or unusual sounds often indicate a specific component issue that, if caught early, can save you from a complete breakdown.

As a West Michigan homeowner, you’re probably familiar with hard water buildup and other regional challenges that can contribute to noisy dishwasher operation. Let’s walk through the most common culprits and what you can realistically do about them.

Common Dishwasher Noises and What They Mean

Grinding or Buzzing Sounds

If your dishwasher sounds like it’s chewing gravel, the wash pump impeller is likely striking something it shouldn’t. The most common cause? Small items that have fallen through the rack—twist ties, bottle caps, bits of broken glass, or even fruit pits.

What to check:

• Remove the lower spray arm (usually just twists off counterclockwise)
• Take out the filter assembly
• Look inside the pump housing for debris
• Feel carefully for any broken pieces of glass or plastic

I’ve seen this at least twice a week on service calls in Grand Rapids. Just last month, a customer’s grinding noise turned out to be a olive pit wedged in the chopper blade assembly.

Pro tip: If you find glass fragments, run several cycles with the dishwasher empty to flush out any remaining shards before running dishes again.

Humming Without Water Flow

A loud humming sound without water entering usually points to the circulation pump trying to run but failing to move water. This often happens when:

• The pump motor is seized or failing
• Something is blocking the pump impeller completely
• The pump inlet is clogged with hard water deposits

For newer dishwashers (especially Bosch, KitchenAid, and Whirlpool models made after 2015), these pumps aren’t serviceable—you’ll need to replace the entire assembly. Expect to pay $200-$350 for parts and labor in the Grand Rapids area.

Rattling During the Wash Cycle

Rattling typically comes from:

Spray arm issues: The most fixable cause. Check that both spray arms spin freely and aren’t hitting the rack or dishes. Sometimes tall plates or bowls can block rotation. The spray arms should have smooth, unrestricted movement when you spin them by hand.

Loose filter or spray arm: The cylindrical filter in the bottom should lock into place with a quarter turn. If it’s not seated properly, it’ll rattle against the pump housing. Same with spray arms—they should click or lock into position.

Worn wash arm support or bearing: The center support that the spray arm spins on can wear out, especially in hard water areas. This allows the arm to wobble and bang against the tub.

Squealing or Screeching Sounds

This high-pitched noise usually indicates bearing failure in either:

• The circulation pump motor bearings (common on 5-10 year old units)
• The drain pump bearings
• Less commonly, the wash motor

Bearing failures are progressive—they start quietly and get worse. If caught early (just occasional squeaking), you might get another 6-12 months of service. Once it’s screeching constantly, replacement is imminent.

Cost reality: Pump motor assemblies typically run $180-$300 parts only, plus $150-$200 labor for installation and testing.

The Drain Pump: A Frequently Overlooked Culprit

Many homeowners don’t realize their dishwasher has two separate pumps: one that circulates wash water through the spray arms, and another smaller pump that drains water out between cycles.

A noisy drain pump typically sounds like:

• Loud buzzing during the drain phase (usually at the end of each cycle)
• Grinding or rattling when draining
• Continuous humming if the drain pump is jammed

Common drain pump issues in Michigan homes:

Hard water buildup is the primary enemy here. Calcium and mineral deposits can bind up the drain pump impeller or damage the pump seal. You’ll often find thick, chalky deposits if your home has well water or particularly hard municipal water.

Glass shards and small debris also jam drain pumps. Unlike the wash pump, the drain pump usually has no accessible filter, so debris goes straight in.

What About the Wash Motor?

On older dishwashers (pre-2010 models, particularly GE and Maytag), a separate wash motor drives the spray arm water circulation. These motors can develop bearing noise, especially if:

• The unit is 8+ years old
• It’s been operated dry (run without water)
• Hard water has infiltrated the motor housing

Wash motor replacement is one of the more expensive repairs: $250-$400 for parts, plus labor. At this price point, if your dishwasher is also showing other age-related issues, replacement might make more financial sense.

DIY Checks You Can Safely Perform

Before calling for service, try these steps:

1. Run a cleaning cycle with dishwasher cleaner. Sometimes mineral buildup on pump components causes noise that clears up once dissolved. Products like Affresh or Finish Dishwasher Cleaner work well.

2. Inspect and clean the filter assembly. This should be done monthly anyway. Remove the cylindrical filter, rinse it thoroughly, and check for cracks or damage.

3. Check spray arm clearance. Load the dishwasher and manually spin both spray arms before starting the cycle. They should rotate freely without contacting dishes or racks.

4. Listen for the timing of the noise. Note when during the cycle the sound occurs—during wash, drain, or both. This helps diagnose which component is failing.

5. Check the garbage disposal knockout plug. If your dishwasher was recently installed and connects to a new garbage disposal, the knockout plug must be removed from the disposal inlet. If it’s still in place, water can’t drain properly, causing strain and noise.

When to Call a Professional

Some situations warrant professional diagnosis:

• Noise accompanied by water leaks
• Error codes on the display
• Dishwasher not completing cycles
• Burning smell with the noise
• Visible damage to pump or motor components
• You’ve cleaned everything and noise persists

Modern dishwashers have electronic controls and components that require proper diagnostic equipment. A qualified technician can pinpoint the exact failing component and provide accurate repair cost estimates.

Don’t Ignore Unusual Noises

A dishwasher that’s getting progressively louder is telling you something is wearing out. Catching these issues early—whether it’s a $5 glass fragment or a $300 pump assembly—prevents more expensive damage down the line. A seized pump can overload the motor and control board, turning a single-component repair into a major expense.

If your dishwasher sounds more like a demolition site than a kitchen appliance, HomeHalo Appliance Repair can diagnose and repair the issue quickly. We serve Grand Rapids and surrounding West Michigan communities with same-week service. Call us at (616) 367-5131 to schedule a diagnostic visit and get your dishwasher running quietly again.