Dishwasher Brush Troubleshooting (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

If your dishwasher brush is clogged or broken, turn off power, remove the brush, clean or replace it, and test. A dirty brush can cause poor cleaning or motor noise.

Confirm the symptom

Dishes not cleaning properly
Unusual motor noise during cycle
Visible debris on the brush
Water pooling at the bottom of the dishwasher

Tools and prep

Screwdriver (flathead or Phillips, depending on model)
Replacement brush (check model number)
Bucket (for water cleanup)
Rubber gloves (for handling dirty parts)
Soft cloth or brush (for cleaning)
Turn off power at circuit breaker or unplug unit

Step-by-step troubleshooting

Turn Off Power
Do: Unplug the dishwasher or turn off the circuit breaker.
Observe: Power is off and dishwasher is safe to handle.
Means: Prevents electrical hazards during repair.
Next: Remove Brush
Remove Brush
Do: Locate the brush near the motor and remove it using a screwdriver.
Observe: Brush is detached and accessible for inspection.
Means: Allows you to check for damage or blockages.
Next: Inspect Brush
Inspect Brush
Do: Check for visible debris, cracks, or wear.
Observe: Brush is either clean and intact or shows signs of damage.
Means: Determines if cleaning or replacement is needed.
Next: Clean or Replace
Clean or Replace
Do: Clean the brush with a cloth and water if clogged. Replace if damaged.
Observe: Brush is either clean or replaced with a new one.
Means: Restores proper function of the dishwasher motor.
Next: Reinstall Brush
Reinstall Brush
Do: Secure the brush back in place with screws.
Observe: Brush is firmly in place and aligned correctly.
Means: Ensures the motor runs smoothly without obstructions.
Next: Test Dishwasher
Test Dishwasher
Do: Plug in or restore power, then run a short cycle to check performance.
Observe: Dishes clean properly and no unusual noises occur.
Means: Confirms the repair was successful.
Next: Done

Common causes

Cause	Likelihood	Difficulty	Part often needed
Clogged brush Food particles and debris accumulate, restricting motor movement.	Common	Easy	Brush
Worn brush Normal wear over time reduces effectiveness and causes noise.	Sometimes	Easy	Brush
Broken brush Physical damage from misuse or age prevents proper function.	Rare	Easy	Brush
Faulty motor Motor issues can mimic brush problems but require different diagnosis.	Rare	Hard	Motor assembly
Improper installation Incorrect brush placement can cause misalignment and noise.	Sometimes	Easy–Medium	Brush
Hard water buildup Mineral deposits can clog the brush and other components.	Sometimes	Easy	Descaler or water softener

Parts matching

Replace your dishwasher brush with a compatible part. Check your model number for exact fit.

Look for 'brush' or 'motor brush' in the part description
Ensure the replacement matches your dishwasher's model number
Check for universal brushes if original part is unavailable
Verify the brush size and shape matches the old one
Purchase from a trusted retailer or manufacturer site

If unsure, take the old brush to a hardware store for a direct comparison.

When to call a professional

Dishwasher still doesn't clean properly after replacing the brush
Unusual noises persist after repair
Water leaks after reinstallation
You cannot locate the brush or motor area
Electrical issues like tripped breakers occur during or after repair

FAQ

How often should I replace my dishwasher brush?

Replace the brush every 1–2 years, or sooner if you notice poor cleaning or noise.

Can I use a universal brush instead of a brand-specific one?

Yes, as long as the universal brush matches the size, shape, and specifications of the original.

Why is my dishwasher making a grinding noise after replacing the brush?

A grinding noise may indicate improper installation, a damaged motor, or a foreign object in the motor housing.

Is it safe to run the dishwasher without the brush?

No, the brush is essential for motor function. Running without it can cause damage or poor performance.

Can hard water affect the dishwasher brush?

Yes, mineral buildup from hard water can clog the brush. Use a dishwasher-safe descaler regularly to prevent this.