Dishwasher Making Loud Rattling Noise

Quick answer

A loud rattling noise in your dishwasher is often caused by loose or broken parts. Turn off the power, check for loose items in the wash arms, and inspect the pump or motor. Replace damaged parts if necessary.

Confirm the symptom

• Hearing a loud rattling or clanking sound during the wash cycle
• Noise occurs even when the dishwasher is empty
• Sound is more noticeable during the high-pressure spray phase

Tools and prep

• Screwdriver set
• Flashlight
• Work gloves
• Plumber's putty (if resealing)
• Turn off the power at the circuit breaker
• Remove dishes and racks for access

Step-by-step troubleshooting

1. Check for Loose Objects
   Do: Inspect the wash arms and spray nozzles for loose or broken parts.
   Observe: Look for wobbling or missing nozzles, or a loose wash arm.
   Means: Loose parts can cause rattling during the spray cycle.
   Next: Tighten or replace the affected parts.
2. Inspect the Wash Arm
   Do: Remove the wash arm and check for damage or wear.
   Observe: Notice cracks, chips, or a bent wash arm.
   Means: A damaged wash arm may vibrate or rattle during operation.
   Next: Replace the wash arm if damaged.
3. Check the Pump Housing
   Do: Look inside the pump housing for loose or broken components.
   Observe: See if the pump impeller is loose or if there are loose screws.
   Means: A loose pump component can create a loud rattling noise.
   Next: Tighten or replace the pump parts as needed.
4. Examine the Motor
   Do: Listen closely to determine if the noise is coming from the motor.
   Observe: Hear a grinding or rattling sound from the motor area.
   Means: A failing motor can produce loud noises and may need replacement.
   Next: Consult a professional if the motor is the issue.
5. Check for Foreign Objects
   Do: Search the bottom of the dishwasher for small objects that may be causing the noise.
   Observe: Find a coin, piece of silverware, or other object trapped in the drain area.
   Means: Foreign objects can create noise when the pump runs.
   Next: Remove the object and clean the area.
6. Inspect the Detergent Dispenser
   Do: Check the detergent dispenser for blockages or loose parts.
   Observe: Notice a loose cap or blockage inside the dispenser.
   Means: A loose dispenser can rattle during the wash cycle.
   Next: Clean or replace the dispenser as needed.

Common causes

Parts matching

If you need to replace parts, look for these common components:

• Wash arm (check for model-specific compatibility)
• Wash arm nozzles (universal or model-specific)
• Pump housing or impeller (model-specific)
• Detergent dispenser (model-specific)

Always verify the dishwasher model number before purchasing replacement parts.

When to call a professional

• The noise persists after checking and replacing all loose or damaged parts
• You hear a loud grinding or screeching sound from the motor area
• You are unsure about accessing or replacing internal components like the motor or pump
• The dishwasher leaks water after attempting repairs
• The noise is accompanied by a burning smell or unusual vibration

FAQ

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