Bosch 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

A Bosch dishwasher making weird noises often has a trapped object or a faulty component. Check the drain pump and filters first. If the noise persists, consider professional repair.

Confirm the symptom

Unusual clicking, grinding, or rattling during operation
Noise occurs during the wash or drain cycle
Sound is consistent and not related to water pressure

Tools and prep

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

Step-by-step troubleshooting

Check for Foreign Objects
Do: Remove the lower rack and inspect the spray arms and drain pump for trapped items like utensils or food particles.
Observe: Any objects blocking the spray arms or drain pump.
Means: Foreign objects can cause grinding or rattling noises.
Next: Remove objects and restart the dishwasher.
Inspect the Drain Pump
Do: Locate the drain pump (usually at the bottom rear) and check for damage or debris.
Observe: Visible damage or clogs in the drain pump.
Means: A faulty or clogged drain pump often causes loud noises.
Next: Clean the pump if clogged; replace if damaged.
Check the Water Inlet Valve
Do: Listen near the water inlet valve during startup for a clicking sound.
Observe: Excessive clicking or water hammer noise.
Means: A faulty valve can create unusual sounds when water flows.
Next: Replace the water inlet valve if faulty.
Test the Motor
Do: Run a short cycle and listen for loud humming or grinding from the motor area.
Observe: Unusual motor noise during operation.
Means: A failing motor can cause loud or grinding noises.
Next: Replace the motor if it's damaged or worn.
Examine the Door Latch
Do: Check the door latch mechanism for misalignment or debris.
Observe: Sticking or misaligned door latch.
Means: A faulty latch can cause clicking or clunking sounds when closing.
Next: Clean or realign the latch; replace if damaged.
Inspect the Filter
Do: Remove and clean the dishwasher filter thoroughly.
Observe: Debris or clogs in the filter.
Means: A clogged filter can lead to unusual noises during the wash cycle.
Next: Clean the filter and restart the dishwasher.
Check the Pump Impeller
Do: Inspect the pump impeller for damage or blockage.
Observe: Cracks or debris in the impeller.
Means: A damaged impeller can cause loud noises during operation.
Next: Replace the impeller if damaged.
Verify Leveling
Do: Ensure the dishwasher is level on the floor.
Observe: Dishwasher is tilted or uneven.
Means: An unlevel appliance can vibrate or make noise.
Next: Adjust the leveling feet to stabilize the unit.

Common causes

Cause	Likelihood	Difficulty	Part often needed
Trapped Object Utensils or debris in the spray arms or drain pump can cause grinding or rattling.	Common	Easy	None
Clogged Drain Pump Debris in the drain pump restricts water flow and causes noise.	Common	Easy–Medium	Drain Pump Cleaner
Faulty Water Inlet Valve A defective valve can cause clicking or water hammer noises during water intake.	Sometimes	Medium	Water Inlet Valve
Worn Motor A damaged motor can produce loud humming or grinding sounds during operation.	Sometimes	Hard	Motor Assembly
Misaligned Door Latch A misaligned or dirty door latch can create clicking or clunking sounds.	Sometimes	Easy	Door Latch Assembly
Clogged Filter A dirty filter can cause unusual noises during the wash cycle.	Common	Easy	Dishwasher Filter
Damaged Pump Impeller Cracks or debris in the impeller can lead to loud noises during operation.	Rare	Hard	Pump Impeller
Unlevel Dishwasher An uneven appliance can vibrate and make noise during cycles.	Sometimes	Easy	None

Parts matching

If you need to replace a part, match your symptoms to the most likely component:

Trapped object: No part needed after removal
Clogged drain pump: Drain Pump Cleaner
Faulty water inlet valve: Water Inlet Valve
Worn motor: Motor Assembly
Misaligned door latch: Door Latch Assembly
Clogged filter: Dishwasher Filter
Damaged pump impeller: Pump Impeller

Always refer to your Bosch dishwasher's manual for specific part numbers and compatibility.

When to call a professional

Noise persists after checking all common causes
You suspect a damaged motor or pump assembly
You're unsure about electrical components or wiring
The dishwasher leaks after attempting repairs
The noise is accompanied by error codes or frequent breakdowns

FAQ

Why is my Bosch dishwasher making a loud grinding noise?

A loud grinding noise is often caused by a trapped object in the spray arms or drain pump, or a damaged pump impeller. Check these areas first.

Can a clogged filter cause a Bosch dishwasher to make noise?

Yes, a clogged filter can cause unusual noises during the wash cycle. Clean the filter regularly to prevent this issue.

How do I know if my water inlet valve is faulty?

Listen for excessive clicking or water hammer noises near the valve during startup. Replace the valve if you notice these symptoms.

Is it normal for my Bosch dishwasher to make some noise during operation?

Some noise is normal, but loud or unusual sounds indicate a problem. Refer to your manual for expected operational sounds.

Should I turn off the power before inspecting the drain pump?

Yes, always turn off the power at the circuit breaker before inspecting or cleaning the drain pump for safety.

Can an unlevel dishwasher cause noise?

Yes, an unlevel dishwasher can vibrate and make noise during cycles. Adjust the leveling feet to stabilize the unit.