Dishwasher Making Weird Noise (Troubleshooting Guide)

On this page

Quick answer
Confirm the symptom
Tools and prep
Step-by-step troubleshooting
Common causes table
Parts matching
When to call a pro
FAQ
Related guides

Quick answer

Turn off the dishwasher and unplug it. Check for trapped objects in the bottom or spray arms. If the noise persists, inspect the drain pump or motor for damage.

Confirm the symptom

Unusual grinding, rattling, or buzzing during operation
Noise occurs during the wash or drain cycle
Sound is not from dishes clinking together

Tools and prep

Screwdriver set
Flashlight
Rubber gloves
Plastic putty knife
Plumber's putty
Turn off power at the circuit breaker
Turn off water supply

Step-by-step troubleshooting

Check for Trapped Objects
Do: Inspect the bottom of the dishwasher and spray arms for loose items or debris.
Observe: Any foreign objects or clogged spray nozzles.
Means: Objects can cause abnormal noises during cycles.
Next: Remove objects and clean nozzles. Run a test cycle.
Inspect the Drain Pump
Do: Locate the drain pump (usually at the bottom) and check for blockages or damage.
Observe: Debris in the pump or signs of wear.
Means: A clogged or faulty pump can create grinding or humming noises.
Next: Clean the pump. If damaged, replace it.
Examine the Motor
Do: Listen for motor sounds while the dishwasher runs. Check for loose motor components.
Observe: Unusual motor noises or wobbling parts.
Means: A failing motor can cause loud or irregular sounds.
Next: Tighten loose parts. If the motor is faulty, consult a professional.
Check the Water Inlet Valve
Do: Inspect the valve for mineral buildup or damage.
Observe: Cracks or sediment in the valve.
Means: A faulty valve can cause buzzing or clicking sounds.
Next: Clean the valve. Replace if damaged.
Test the Suspension System
Do: Look for worn or broken suspension springs or shock absorbers.
Observe: Loose or damaged suspension components.
Means: A faulty suspension can cause the dishwasher to vibrate excessively.
Next: Replace damaged suspension parts.
Verify Leveling
Do: Ensure the dishwasher is level on the floor.
Observe: Uneven appliance.
Means: An unlevel dishwasher can create noise due to imbalance.
Next: Adjust the feet to level the unit.

Common causes

Cause	Likelihood	Difficulty	Part often needed
Trapped Objects Items in the bottom or spray arms can create noise during cycles.	Common	Easy	None
Clogged Drain Pump Debris in the pump can cause grinding or humming sounds.	Common	Easy–Medium	Drain Pump
Faulty Motor A damaged motor can produce loud or irregular noises.	Sometimes	Hard	Motor
Faulty Water Inlet Valve Mineral buildup or damage can cause buzzing or clicking.	Sometimes	Medium	Water Inlet Valve
Worn Suspension System Loose or broken suspension parts can lead to vibration and noise.	Sometimes	Medium	Suspension Springs/Shock Absorbers
Unlevel Dishwasher An unbalanced unit can create noise due to instability.	Rare	Easy	None

Parts matching

Common parts needed for a noisy dishwasher include:

Drain Pump
Water Inlet Valve
Motor
Suspension Springs
Shock Absorbers

Purchase OEM parts for compatibility and reliability.

When to call a professional

Noise persists after cleaning and checking all components
Motor or electrical components are damaged
You're unsure about electrical repairs
The dishwasher is under warranty
Noise is accompanied by leaks or poor cleaning performance

FAQ

Why is my dishwasher making a grinding noise?

A grinding noise often indicates a clogged drain pump or a faulty motor. Check the pump for debris and inspect the motor for damage.

Can a noisy dishwasher be fixed without professional help?

Many common issues like trapped objects or clogged pumps can be resolved by the homeowner. However, electrical or motor problems should be handled by a professional.

How do I know if the motor is bad?

A bad motor may produce loud humming, buzzing, or clicking noises. If the motor doesn't run or smells burnt, it likely needs replacement.

Is it normal for a dishwasher to make some noise?

Some noise is normal during cycles, especially during the wash and drain phases. However, loud or unusual noises typically indicate a problem.

Can a faulty water inlet valve cause noise?

Yes, a faulty water inlet valve can cause buzzing or clicking sounds due to mineral buildup or internal damage.