Dishwasher Making a Grinding Noise

Quick answer

A grinding noise in your dishwasher is often caused by a loose or broken component. Turn off the power, check for loose parts, and clean the drain pump to resolve the issue.

Confirm the symptom

• Grinding noise during the wash or drain cycle
• Noise is constant or rhythmic
• Noise gets louder over time

Tools and prep

• Screwdriver set — To access and tighten internal components
• Flashlight — To see inside the dishwasher clearly
• Soft brush or vacuum — To clean debris from the drain pump
• Socket wrench set — To remove stubborn parts if needed

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Prep & safety

• Turn off the power to the dishwasher at the circuit breaker to ensure safety.
• Allow the dishwasher to cool down before starting any inspection.

Step-by-step troubleshooting

1. Check for Loose Parts
   Do: Open the dishwasher and visually inspect the interior for any loose or broken components, such as the spray arm or rack.
   Observe: Look for any parts that appear to be vibrating or moving during operation.
   Means: Loose parts can cause grinding noises when they move during the cycle.
   Next: If loose parts are found, tighten or replace them.
2. Inspect the Spray Arm
   Do: Remove the spray arm and check for blockages or damage.
   Observe: Look for clogged spray holes or cracks in the spray arm.
   Means: A clogged or damaged spray arm can cause uneven water flow and noise.
   Next: Clean or replace the spray arm as needed.
3. Clean the Drain Pump
   Do: Locate the drain pump and use a soft brush or vacuum to remove any debris or food particles.
   Observe: Check for visible debris or buildup in the pump area.
   Means: Debris in the drain pump can cause a grinding noise during the drain cycle.
   Next: If the pump is clean, move to the next step.
4. Check the Motor
   Do: Listen closely to the motor during operation to determine if the noise is coming from there.
   Observe: A grinding noise from the motor may indicate a worn-out bearing or belt.
   Means: A faulty motor can produce a grinding sound and may need replacement.
   Next: If the motor is faulty, consider replacing it.
5. Inspect the Pump Impeller
   Do: Remove the pump cover and check the impeller for damage or blockage.
   Observe: Look for any broken or missing parts on the impeller.
   Means: A damaged impeller can cause a grinding noise during the wash cycle.
   Next: Replace the impeller if necessary.
6. Check the Bearings
   Do: Inspect the bearings on the motor and pump for wear or damage.
   Observe: Look for signs of wear, such as rust or pitting.
   Means: Worn bearings can cause a grinding noise and should be replaced.
   Next: Replace any worn bearings.
7. Test the Dishwasher
   Do: Reconnect the power and run a test cycle to see if the noise persists.
   Observe: Listen for any remaining grinding noises during the cycle.
   Means: If the noise is gone, the issue has been resolved.
   Next: If the noise continues, consider calling a professional.
8. Consult the Manual
   Do: Refer to the dishwasher's manual for specific troubleshooting steps and part diagrams.
   Observe: Look for any model-specific instructions or warnings.
   Means: The manual can provide valuable information for your specific dishwasher model.
   Next: Follow the manual's recommendations for further troubleshooting.

Common causes

Parts you might need

When replacing parts, ensure they match your dishwasher model and specifications.

• Spray arm: match the model number and spray pattern of the original part.
• Drain pump: match the voltage and flow rate of the original pump.
• Motor: match the horsepower and voltage of the original motor.
• Pump impeller: match the size and material of the original impeller.
• Bearings: match the size and type of the original bearings.

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Always refer to the dishwasher's manual for specific part requirements and installation instructions.

When to call a professional

• If the grinding noise persists after cleaning and tightening all components.
• If you are unable to locate the source of the noise.
• If the motor or pump needs to be replaced and you are not comfortable with the installation.
• If the dishwasher is under warranty and you do not want to risk voiding it by attempting repairs yourself.

FAQ