Quick answer
Turn off the dishwasher and unplug it. Check for foreign objects in the drain pump or spray arms. If the noise continues, the motor or pump may need replacement.
Confirm the symptom
- Grinding noise during wash or drain cycle
- Noise is loud and consistent
- Happens even when dishwasher is empty
Tools and prep
- Screwdriver set
- Work gloves
- Flashlight
- Plastic putty knife
- Bucket (for water)
- Turn off power at circuit breaker
- Turn off water supply
Step-by-step troubleshooting
- Unplug and InspectDo: Unplug the dishwasher and remove the lower rack.Observe: Look for visible objects or debris in the bottom of the unit.Means: Foreign objects can cause grinding noises.Next: If found, remove debris and test.
- Check Spray ArmsDo: Remove the spray arms and inspect for clogs or damage.Observe: Spray arms may have blocked nozzles or bent parts.Means: Clogged spray arms can cause uneven water flow and noise.Next: Clean or replace spray arms as needed.
- Inspect Drain PumpDo: Locate the drain pump (usually at the bottom rear) and check for obstructions.Observe: Look for food particles, small objects, or worn pump components.Means: A clogged or faulty drain pump is a common cause of grinding noises.Next: Clean the pump or replace if damaged.
- Test MotorDo: Plug in the dishwasher and listen for the motor to engage.Observe: If the motor hums but doesn't turn, it may be seized.Means: A seized motor can cause grinding sounds during operation.Next: Replace the motor if it's not functioning.
- Check for Loose PartsDo: Inspect the interior for loose screws or components.Observe: Any loose parts may vibrate or grind during operation.Means: Loose hardware can cause unusual noises.Next: Tighten or replace loose parts.
- Test After RepairsDo: Plug in the dishwasher and run a short cycle.Observe: Listen for any remaining grinding noises.Means: This confirms if the issue is resolved.Next: If noise persists, consider professional help.
Common causes
| Cause | Likelihood | Difficulty | Part often needed |
|---|---|---|---|
| Foreign Objects in Pump Food particles or small items can get lodged in the drain pump, causing grinding. | Common | Easy | Drain Pump |
| Clogged Spray Arms Blocked spray arm nozzles can cause uneven water flow and noise. | Common | Easy | Spray Arms |
| Worn Motor Bearings Aging motor bearings can cause grinding sounds during operation. | Sometimes | Medium | Motor Assembly |
| Loose or Broken Components Loose screws or parts can vibrate and create noise. | Sometimes | Easy | Screws, Mounts |
| Faulty Drain Pump A damaged or worn drain pump may produce grinding noises. | Sometimes | Medium | Drain Pump |
| Seized Motor A motor that's seized or not turning properly can cause grinding. | Rare | Hard | Motor Assembly |
Parts matching
Common parts needed for a grinding dishwasher noise:
- Drain Pump
- Spray Arms
- Motor Assembly
- Spray Arm Nozzles
- Pump Housing Gasket
Purchase OEM parts for compatibility and reliability.
When to call a professional
- Noise persists after removing all visible obstructions
- Motor makes loud humming but doesn't turn
- You're unsure about electrical components or motor replacement
- Dishwasher leaks water after repairs
- Noise is coming from the control panel area
- You don't have the tools or confidence to complete repairs
FAQ
Can I use vinegar to clean the spray arms?
Yes, a vinegar solution can help dissolve mineral buildup in spray arms. Soak them in a mixture of equal parts water and vinegar for 30 minutes before cleaning.
How do I know if the motor is seized?
If the motor hums but doesn't turn when powered, it's likely seized. You may also notice a burning smell or excessive heat from the motor housing.
Is it safe to replace the drain pump myself?
Yes, if you follow proper safety steps like turning off power and water. However, if you're unsure, consult a professional.
Why is my dishwasher making noise when it's empty?
Noise when empty often indicates a mechanical issue like a foreign object in the pump or a faulty motor, rather than a problem with dishes.
Can a clogged filter cause a grinding noise?
Yes, a clogged filter can restrict water flow and cause unusual noises. Clean or replace the filter if it's dirty or damaged.