Last Updated: June 2026 | Reading Time: 7 minutes
Is your dishwasher making a loud noise during the wash cycle that it never made before? An unusually noisy dishwasher is one of the most common appliance complaints — and while some dishwasher sounds are completely normal, others are warning signs that something needs attention. The good news is that most causes of a dishwasher making a loud noise are easy to identify and fix yourself at home.
In this guide, we’ll walk you through the 6 most common reasons your dishwasher is making a loud noise, what each sound means, and exactly what to do about it.
Is It Normal for a Dishwasher to Make Noise?
Yes — dishwashers are never completely silent. Normal dishwasher sounds include:
- Soft humming from the pump motor during wash and drain cycles
- Gentle swishing as water sprays from the rotating spray arms
- Clicking as the spray arms rotate and water pressure shifts
- Draining sounds at the end of each cycle — a louder hum as the drain pump removes water
The key question is: Is the noise new, louder than usual, or a different type than before?
Quick Diagnosis: What Type of Noise Do You Hear?
- Loud grinding or buzzing → debris in the pump or worn pump bearing
- Banging or thumping → dishes hitting each other or spray arm hitting dishes
- Rattling → loose item inside the dishwasher or loose panel
- Loud humming during drain → drain pump struggling with a blockage
- Squealing or screeching → worn pump bearing or inlet valve
- Knocking → spray arm hitting an overloaded rack item
Cause 1: Spray Arm Hitting Dishes — Most Common Cause
This is the #1 reason for a dishwasher making a loud noise — and the easiest to fix.
The spray arms rotate during the wash cycle to distribute water over the dishes. When tall items, protruding handles, or overloaded racks block the spray arm’s rotation, the arm repeatedly hits these items — producing a loud banging, knocking, or thumping sound during the cycle.
Signs this is the cause:
- Loud banging or knocking that is rhythmic and repetitive
- Noise stops when you open the door and reposition dishes
- The noise started after loading a particularly large or awkward load
How to fix it:
- Open the dishwasher door and remove the bottom rack
- Spin the lower spray arm by hand — it should rotate freely with no obstruction
- Check for any items hanging down from the bottom rack or positioned too low
- Reload the rack — make sure all handles, long utensils, and tall items are secured and do not protrude below the rack level
- Replace the bottom rack and spin the spray arm again to confirm it clears all items
- Repeat for the upper spray arm with the top rack
Cost: $0 | Time: 5 minutes
Pro Tip: Before starting every cycle, spin both spray arms by hand after loading. This 10-second check prevents the most common cause of a dishwasher making a loud noise and also ensures better cleaning performance.
Cause 2: Debris in the Wash Pump or Filter
Small food particles, broken glass, fruit pits, or small utensils can pass through the filter and reach the wash pump. When the pump impeller hits this debris during operation, it produces a loud grinding, buzzing, or rattling sound.
Signs of debris in the pump:
- Loud grinding or buzzing sound that is constant throughout the wash cycle
- The noise is coming from the bottom of the dishwasher
- You recently washed dishes with small bones, fruit pits, or broken items
How to fix it:
- Turn off and unplug the dishwasher
- Remove the bottom rack and clean the filter thoroughly — twist counter-clockwise and lift out
- Check the filter housing and the area below it for any visible debris — remove with tweezers or needle-nose pliers
- Reach into the pump inlet area (directly below where the filter sits) and feel for any foreign objects
- Remove any debris found and reinstall the filter
- Run a short test cycle and listen for the noise
Cost: $0 | Time: 15–20 minutes
Cause 3: Worn or Failing Wash Pump Bearing
The wash pump circulates water through the spray arms during the wash cycle. Its motor has a bearing that allows it to spin smoothly. When this bearing wears out over years of use, it produces a loud humming, whining, or grinding noise that is present throughout the entire wash cycle.
Signs of a worn pump bearing:
- Consistent loud humming or grinding that has gradually gotten worse over months
- Noise is present from the very start of the wash cycle
- The dishwasher is over 7–8 years old
- No debris found in the pump or filter
How to fix it:
The wash pump assembly typically needs to be replaced as a complete unit when the bearing fails:
- Unplug the dishwasher
- Access the pump — usually by removing the bottom spray arm, filter, and filter housing to reveal the pump assembly underneath
- Disconnect the wiring and remove the pump assembly
- Install a replacement pump assembly ($40–$100 on Amazon — search your dishwasher model number)
- Reassemble and run a test cycle
Cost: $40–$100 | Time: 45–60 minutes
For model-specific pump replacement guides, visit RepairClinic.com and enter your dishwasher model number.
Cause 4: Loud Noise During Drain Cycle — Drain Pump Issue
If the loud noise only happens during the drain phase — usually at the end of a cycle or between wash phases — the drain pump is likely the source. A drain pump making loud noise is usually caused by debris blocking the impeller or a worn pump motor.
Signs of a drain pump issue:
- Loud grinding or buzzing specifically during the drain phase
- Water drains slowly or not completely
- The noise started alongside a draining problem
How to fix it:
- Unplug the dishwasher
- Access the drain pump — usually located at the bottom front of the dishwasher behind the kick panel, or accessible through the bottom of the tub
- Check for debris blocking the drain pump impeller — small pieces of glass, food, or labels are common culprits
- Remove any debris found
- If the pump motor is worn, replace the drain pump ($25–$70 on Amazon)
- Run a test cycle and confirm the noise has stopped
Cost: $0–$70 | Time: 30–45 minutes
Cause 5: Loose Dishes Rattling
Sometimes the cause of a dishwasher making a loud noise has nothing to do with the machine itself — lightweight dishes, cups, or lids that are not secured properly rattle against each other during the wash cycle, producing a loud clattering sound.
Signs of loose dish rattling:
- Loud rattling or clattering sound that varies in intensity during the cycle
- The noise sounds like dishes knocking together rather than a mechanical sound
- Noise stops when you open the door and rearrange items
How to fix it:
- Make sure all cups and glasses are placed upside down and secured in the rack tines
- Lightweight plastic items should be secured so they cannot flip or move during the cycle
- Lids should be placed in the cutlery basket or secured flat
- Do not overload the dishwasher — items need enough space that they cannot contact each other
Cost: $0 | Time: 2 minutes
Cause 6: Water Inlet Valve Making Noise
The water inlet valve opens at the beginning of each cycle to fill the dishwasher with water. Over time, mineral deposits and wear can cause the valve to vibrate or squeal loudly as water passes through it — producing a loud buzzing or squealing sound specifically at the start of the fill cycle.
Signs of a noisy water inlet valve:
- Loud buzzing or squealing at the very beginning of the cycle — specifically when water first enters
- Noise stops once the dishwasher is full and the valve closes
- You live in a hard water area and the dishwasher has not been descaled recently
How to fix it:
- First try running a vinegar cleaning cycle — mineral buildup in the valve can cause buzzing and sometimes clears with descaling
- If the noise continues, the water inlet valve needs replacing ($20–$50 on Amazon — search your model number)
- Unplug the dishwasher and turn off the water supply
- Access the inlet valve — usually at the bottom left or right behind the kick panel
- Disconnect the water line and wiring, remove the old valve, install the new one
- Restore water supply, plug in, and run a test cycle
Cost: $0–$50 | Time: 30–40 minutes
Quick Reference: Dishwasher Making Loud Noise
| Noise Type | Most Likely Cause | Fix | Cost |
|---|---|---|---|
| Banging / knocking | Spray arm hitting dishes | Reposition dishes | $0 |
| Grinding / buzzing (wash) | Debris in wash pump | Remove debris | $0 |
| Humming / grinding (constant) | Worn pump bearing | Replace pump assembly | $40–$100 |
| Grinding (drain only) | Drain pump debris or wear | Clear debris or replace pump | $0–$70 |
| Clattering / rattling | Loose dishes | Rearrange and secure dishes | $0 |
| Buzzing at fill start | Noisy water inlet valve | Descale or replace valve | $0–$50 |
Normal vs Abnormal Dishwasher Sounds
| Sound | Normal? | Action Needed? |
|---|---|---|
| Soft humming throughout cycle | ✅ Normal | No |
| Gentle swishing of water | ✅ Normal | No |
| Clicking as spray arms rotate | ✅ Normal | No |
| Draining hum at end of cycle | ✅ Normal | No |
| Loud grinding during wash | ❌ Abnormal | Yes — check pump |
| Banging during cycle | ❌ Abnormal | Yes — check spray arms |
| Squealing during fill | ❌ Abnormal | Yes — check inlet valve |
| Rattling throughout cycle | ⚠️ Usually dishes | Yes — rearrange load |
Prevention Tips
- Spin spray arms by hand before every cycle to check for obstructions
- Scrape large food particles off dishes before loading — they can reach the pump
- Clean the filter monthly to prevent debris buildup
- Never put broken glass or items with loose labels in the dishwasher
- Run a descaling cycle monthly in hard water areas — mineral buildup causes pump and valve noise
- Do not overload the dishwasher — overcrowding causes dishes to rattle and spray arms to be blocked
When to Call a Professional
Call a technician if your dishwasher is making a loud noise and:
- You have removed all debris from the pump and filter but the grinding noise continues
- The wash pump assembly needs replacing and you are not comfortable disassembling the dishwasher
- The noise is accompanied by water leaking or the dishwasher not cleaning properly
- Your dishwasher is still under warranty
Final Thoughts
A dishwasher making a loud noise is most commonly caused by the spray arm hitting dishes or debris in the wash pump — both of which are free to fix and take under 20 minutes. Always start by spinning the spray arms and checking the filter before assuming any part has failed. A 5-minute check before each cycle prevents the most common causes entirely.
Did this guide help you fix your noisy dishwasher? Leave a comment and tell us what the noise was and which fix worked!
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