Dishwasher Making Grinding Noise

Quick answer

If your dishwasher is making a grinding noise, first ensure it's empty and unplugged. Check for debris in the drain or pump. If the noise persists, you may need to inspect the wash impeller or motor. Always prioritize safety by turning off the power and water supply before starting any repairs.

Confirm the symptom

• Dishwasher produces a grinding or rattling noise during operation.
• Noise occurs primarily during the wash or drain cycle.
• Dishes are not cleaned properly.
• Dishwasher drains slowly or not at all.
• No visible leaks under the dishwasher.

Tools and prep

• Screwdriver (Phillips and flathead).
• Pliers.
• Multimeter (for electrical checks).
• Flashlight.
• Towels to soak up any water.
• Turn off the power to the dishwasher at the circuit breaker.
• Shut off the water supply to the dishwasher.

Step-by-step troubleshooting

1. Check for Debris
   Do: Remove the bottom rack and check the drain area for debris.
   Observe: Look for food particles, glass shards, or other objects.
   Means: If debris is found, remove it carefully.
   Next: Run a short cycle to see if the noise persists.
2. Inspect the Drain Impeller
   Do: Remove the lower access panel and locate the drain impeller.
   Observe: Check for damage or blockages.
   Means: If damaged, replace the impeller.
   Next: If clear, proceed to the next step.
3. Check the Wash Impeller
   Do: Locate the wash impeller at the bottom of the dishwasher.
   Observe: Ensure it spins freely and is not damaged.
   Means: If damaged, replace the wash impeller.
   Next: If clear, check the motor.
4. Inspect the Motor
   Do: Locate the motor and check for any unusual noises when running.
   Observe: Use a multimeter to test the motor for continuity.
   Means: If the motor is faulty, it may need replacement.
   Next: If the motor is fine, check the pump.
5. Check the Pump
   Do: Locate the pump and check for any blockages or damage.
   Observe: Ensure the pump spins freely.
   Means: If damaged, replace the pump.
   Next: If the pump is fine, check the spray arms.
6. Inspect the Spray Arms
   Do: Remove the spray arms and check for blockages.
   Observe: Ensure water can flow freely through the arms.
   Means: Clean or replace the spray arms if necessary.
   Next: If all components are clear, the issue may be more complex.

Common causes

Parts matching

If you need to replace any parts, ensure they are compatible with your dishwasher model. Always turn off the power and water supply before replacing parts.

• Drain Impeller
• Wash Impeller
• Motor
• Pump
• Spray Arms

Keep a record of the parts you replace and when, for future reference.

When to call a professional

• If the dishwasher continues to make noise after checking all components.
• If you are not comfortable performing electrical or plumbing tasks.
• If the dishwasher leaks water during inspection.
• If the dishwasher does not operate at all after inspection.
• If you suspect a gas leak or other serious issue.
• If you need to replace the motor or pump and are unsure how.

FAQ

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