Dishwasher Motor Making Loud Noise

Quick answer

First, ensure the dishwasher is empty and unplugged. Check for debris in the motor or pump. If the noise persists, inspect the motor and related parts for wear or damage. Replace any faulty components as needed.

Confirm the symptom

• Dishwasher makes loud grinding, rattling, or humming noises during operation.
• Noise occurs primarily during the wash or drain cycle.
• Dishwasher struggles to drain water or complete cycles.
• Motor sounds unusually loud even when the dishwasher is idle.
• Noises seem to come from the bottom of the dishwasher.

Tools and prep

• Screwdriver (Phillips and flathead)
• Pliers
• Multimeter
• Flashlight
• Replacement parts (if needed)
• Towel to soak up any water
• Unplug the dishwasher and turn off the water supply before starting any repairs.

Step-by-step troubleshooting

1. Inspect for Debris
   Do: Remove the bottom dish rack and check for debris around the motor and pump.
   Observe: Look for any foreign objects or food particles that might be causing the noise.
   Means: If debris is found, remove it carefully.
   Next: If no debris is found, proceed to the next step.
2. Check the Drain Impeller
   Do: Locate the drain impeller at the bottom of the dishwasher.
   Observe: Ensure it spins freely and is not damaged.
   Means: If damaged, it may need replacement.
   Next: If the impeller is fine, check the motor.
3. Test the Motor
   Do: Use a multimeter to test the motor for continuity.
   Observe: Follow the manufacturer's guidelines for proper testing.
   Means: If the motor is faulty, it will need to be replaced.
   Next: If the motor is working, check the motor mount.
4. Inspect the Motor Mount
   Do: Check if the motor mount is secure and not damaged.
   Observe: A loose or damaged mount can cause excessive noise.
   Means: Tighten or replace the mount as needed.
   Next: If the mount is fine, inspect the wash impeller.
5. Check the Wash Impeller
   Do: Locate the wash impeller and ensure it spins freely.
   Observe: Look for any damage or obstructions.
   Means: Replace the impeller if it is damaged.
   Next: If the impeller is fine, check the wash arm.
6. Inspect the Wash Arm
   Do: Remove the lower wash arm and check for blockages.
   Observe: Ensure the arm spins freely and is not clogged.
   Means: Clean or replace the wash arm if necessary.
   Next: If the wash arm is fine, test the dishwasher.
7. Test the Dishwasher
   Do: Reassemble any parts you removed and plug the dishwasher back in.
   Observe: Run a test cycle to see if the noise persists.
   Means: If the noise is gone, the issue is resolved. If not, further inspection is needed.
   Next: If the noise continues, consider calling a professional.

Common causes

Parts matching

Here are the common parts that might need replacement if your dishwasher motor is making loud noises.

• Drain Impeller: Ensures water is pumped out properly.
• Motor: Powers the dishwasher's operations.
• Motor Mount: Secures the motor in place.
• Wash Impeller: Circulates water during the wash cycle.
• Wash Arm: Distributes water throughout the dishwasher.

Always ensure you have the correct replacement part for your specific dishwasher model.

When to call a professional

• If the dishwasher continues to make loud noises after inspection.
• If you are not comfortable performing the repairs yourself.
• If the motor or other critical components are damaged beyond repair.
• If the dishwasher leaks water during the inspection process.
• If you encounter any electrical issues beyond basic testing.

FAQ

Related guides

• dishwasher making strange noises
• dishwasher motor making loud noise

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