Dishwasher Started Making 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 spray arms or drain pump. If the noise persists, inspect the motor or consult a professional.

Confirm the symptom

Unusual grinding, rattling, or humming during operation
Noise started recently without prior issues
Dishes not cleaning properly alongside the noise

Tools and prep

Screwdriver set
Flashlight
Work gloves
Plastic putty knife
Bucket (for water catch)
Turn off power at circuit breaker
Shut off water supply

Step-by-step troubleshooting

Inspect Spray Arms and Hoses
Do: Remove the lower spray arm and check for debris or obstructions.
Observe: Look for trapped objects or clogged nozzles.
Means: Debris can cause grinding or rattling sounds.
Next: Clean or replace spray arm if damaged.
Check Drain Pump
Do: Locate the drain pump (usually at the bottom rear) and inspect for blockages.
Observe: Look for food particles or foreign objects.
Means: A clogged drain pump can create loud noises during draining.
Next: Remove debris and test the dishwasher.
Examine Motor and Bearings
Do: Listen closely to the motor during operation.
Observe: A grinding or squealing noise may indicate worn bearings.
Means: Worn motor bearings can cause continuous noise.
Next: Consider professional repair if motor noise persists.
Test Water Inlet Valve
Do: Check the water inlet valve for mineral buildup or damage.
Observe: Look for cracks or sediment accumulation.
Means: A faulty valve can cause humming or clicking sounds.
Next: Replace the valve if damaged.
Inspect Door Latch and Seal
Do: Check the door latch and rubber seal for damage or misalignment.
Observe: Look for gaps or broken parts.
Means: A faulty door mechanism can cause rattling or vibration.
Next: Adjust or replace the latch/seal as needed.
Check for Loose Components
Do: Look inside and under the dishwasher for loose parts.
Observe: Identify any loose screws or vibrating components.
Means: Loose parts can cause rattling or knocking sounds.
Next: Tighten or secure all loose components.
Run a Diagnostic Cycle
Do: Consult your dishwasher's manual to run a diagnostic test.
Observe: Note any error codes or specific noise patterns.
Means: Diagnostic tests can pinpoint internal issues.
Next: Refer to manual for error code solutions.

Common causes

Cause	Likelihood	Difficulty	Part often needed
Clogged Spray Arm or Nozzles Debris blocks water flow, causing grinding or rattling.	Common	Easy	Spray arm
Blocked Drain Pump Food particles or foreign objects block the pump.	Common	Easy–Medium	Drain pump
Worn Motor Bearings Friction from worn bearings creates grinding noise.	Sometimes	Hard	Motor assembly
Faulty Water Inlet Valve Mineral buildup or cracks cause humming or clicking.	Sometimes	Medium	Water inlet valve
Loose or Damaged Components Vibrating parts create rattling or knocking sounds.	Sometimes	Easy	Screws or brackets
Malfunctioning Door Latch or Seal Improper closure causes vibration or rattling.	Rare	Easy	Door latch or seal
Internal Electrical Issues Faulty wiring or control board causes irregular noises.	Rare	Hard	Control board

Parts matching

Common parts needed for a noisy dishwasher include:

Spray arm
Drain pump
Water inlet valve
Door latch or seal
Motor assembly
Control board

Purchase OEM parts for compatibility and reliability.

When to call a professional

Noise persists after cleaning and tightening parts
You hear a loud grinding or burning smell from the motor
Dishwasher leaks or doesn't drain properly
Error codes appear that you can't resolve
You're unsure about electrical or internal repairs

FAQ

Can I use vinegar to clean the spray arm?

Yes, a vinegar solution can help dissolve mineral buildup, but avoid abrasive cleaners that may damage components.

How often should I clean the drain pump?

Clean the drain pump every 3–6 months to prevent blockages and noise.

Why is my dishwasher making a humming noise?

A humming noise often indicates a faulty water inlet valve or motor issue.

Is a rattling noise always a serious problem?

Not always; it could be a loose component, but it may also indicate a worn motor or pump.

Can I replace the motor myself?

Motor replacement is complex and requires electrical knowledge; consider professional help.