Dishwasher making loud noise? Grinding, buzzing, banging and rattling, shouldn’t be ignored.
The good news? Not all of these issues require a technician. In many cases, you can identify, and even fix, the problem yourself.
Skip to:
- Identify the noise
- Dishwasher making loud noise: What to do
- When to call a professional
- How to keep a dishwasher quiet: Tips
Identify the noise
The type of noise your dishwasher is making can help pinpoint the root cause.
Here we give you some common dishwasher noises and what they usually mean. Then you can skip straight to the most relevant fix.
🍽️ Grinding noise
- Possible cause: Food debris or a foreign object stuck in the chopper blade or pump.
- What to do: Remove the bottom rack and inspect the area around the spray arms and filter. Clear any obstructions.
Skip to: Check for loose or misplaced items + inspect the spray arms
🍽️ Buzzing or humming noise
- Possible cause: Normal motor function (brief buzzing during draining is usually normal), or a failing motor.
- What to do: If the noise is louder than usual or constant, inspect the motor and pump. You may need professional help for replacement.
Skip to: Examine the pump and motor assembly
🍽️ Rattling or clanking noise
- Possible cause: Loose dishes or utensils inside the dishwasher or broken spray arm.
- What to do: Rearrange dishes and check for loose items. Ensure that utensils are placed securely in the basket.
Skip to: Check for loose or misplaced items + inspect the spray arms
🍽️ Squealing or screeching noise
- Possible cause: Worn bearings in the motor or water inlet valve issues.
- What to do: Lubricate or replace faulty parts. Consult a technician if you’re not confident handling these repairs.
Skip to: Replace worn or broken parts
🍽️ Banging or thumping noise
- Possible cause: Water hammer (sudden change in water pressure) or the spray arm hitting something.
- What to do: Secure hoses and check for objects obstructing spray arms.
Skip to: Inspect the spray arms + check the water inlet valve
Dishwasher making loud noise: What to do
1. Check for loose or misplaced items
It may seem obvious, but one of the most common reasons for strange noises in a dishwasher is improperly loaded dishes or foreign objects.
Steps to take:
- Remove all dishes.
- Inspect the bottom of the dishwasher for fallen utensils or debris.
- Ensure spray arms can rotate freely.
- Re-load dishes according to the manufacturer’s loading instructions.
Even small items like fruit pits or popcorn kernels can cause significant grinding or rattling sounds.
2. Clean the filter and drain area
Over time, the dishwasher filter and drain area can become clogged with food particles, leading to loud grinding or humming noises.
How to clean it:
- Unplug the dishwasher or turn off power at the breaker.
- Remove the bottom rack to access the drain and filter.
- Twist and lift out the filter, rinse it under warm water, and use a soft brush to remove gunk.
- Check the drain for blockages or debris.
- Reassemble all parts and test the machine.
Cleaning your filter regularly (ideally once a month) can prevent noise and improve performance.
3. Inspect the spray arms
Spray arms rotate to distribute water throughout the dishwasher. If they’re obstructed or damaged, they can create clicking or banging sounds.
What to look for:
- Cracks or broken pieces on the spray arms.
- Obstructions (like food or small objects) stuck in the nozzles.
- Loose mounting or wobbly movement.
Fix it:
- Remove the spray arms and rinse them under running water.
- Use a toothpick or soft brush to clear blocked holes.
- Replace the spray arms if damaged or worn.
4. Examine the pump and motor assembly
If you hear loud grinding or humming that doesn’t go away, the problem might be with the pump or motor.
What it does:
- The pump circulates water and helps drain it out.
- The motor powers the pump.
Troubleshooting tips:
- Disconnect power before inspecting.
- Look for signs of wear or damage.
- If the motor is hot or smells burnt, it may need replacement.
Unless you’re confident with appliance repairs, it’s wise to contact a professional to diagnose or replace the motor assembly.
5. Check the water inlet valve
A faulty water inlet valve can cause a high-pitched screeching or buzzing sound during the fill cycle.
What to do:
- Shut off water supply and power.
- Inspect the valve where the water line connects to the dishwasher.
- Listen for abnormal noises during the fill cycle.
If the valve is defective or blocked, it should be replaced. DIY replacement is possible, but be sure to follow safety procedures or hire a technician.
6. Look into the drain pump
A loud buzzing or humming during the draining cycle can mean your drain pump is either blocked or failing.
Steps:
- Check the drain hose and pump for blockages.
- Remove any food particles, glass shards, or debris.
- Run a test cycle to see if the sound persists.
If the pump itself is malfunctioning, a replacement will be necessary.
7. Secure the dishwasher
If your dishwasher is vibrating or making banging sounds, it may not be properly secured in its cabinet.
What to check:
- Mounting brackets: Ensure the dishwasher is tightly screwed into the counter or cabinet.
- Leveling feet: Use a level to check if the dishwasher sits flat.
How to fix:
- Tighten all brackets.
- Adjust the feet underneath to level the appliance.
- Place anti-vibration pads or insulation around the unit.
A poorly secured dishwasher can shake or knock against adjacent cabinets, amplifying internal sounds.
8. Replace worn or broken parts
Some dishwasher parts naturally wear out over time and may cause noise issues as they deteriorate. Common culprits include:
- Bearings
- Pump impellers
- Motor brushes
- Spray arm bushings
If you’ve already identified the part causing the noise, you can typically order a replacement from the manufacturer or a parts supplier.
Pro tip: Always look up your dishwasher’s model number before purchasing parts. You can usually find it on the inside door frame or side panel.
When to call a professional
If you’ve checked everything and the noise persists – or if you’re uncomfortable with taking the dishwasher apart – it’s time to call in the pros.
Here are some signs you should consult a technician:
👉 The motor or pump is overheating.
👉 Burning smells accompany the noise.
👉 Electrical issues or water leaks are present.
👉 Replacing parts requires specialized tools or skills.
Professional diagnostics can save you time and prevent further damage.
How to keep a dishwasher quiet: Tips
A well-maintained dishwasher not only runs quieter but lasts longer. Here are some tips to prevent future noise issues:
✅ Rinse dishes lightly before loading to avoid clogs.
✅ Clean the filter monthly.
✅ Run hot water in the sink before starting a cycle to improve cleaning.
✅ Use dishwasher-safe items only – especially for plasticware and utensils.
✅ Check spray arms regularly for wear or blockage.
✅ Schedule regular maintenance, especially if your water supply has high mineral content.
