How to Fix a Loud Humming Noise in Your Dishwasher

If your dishwasher makes a persistent humming noise, here are the most common causes and step-by-step solutions:

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1. Check the Drain Pump

• Common Issue: Blocked or struggling pump
• Steps:
  • Unplug the dishwasher.
  • Locate the drain pump (usually at the bottom).
  • Remove debris (food bits, glass, paper) from the pump area.

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2. Inspect the Circulation Motor

• Common Issue: Loud noise during wash cycle; worn motor bearings or jammed fan.
• Steps:
  • Remove the bottom panel to access the motor.
  • Manually turn the motor—if it feels stiff or is noisy, consider replacement.
  • Note: Replacing the motor might require a professional.

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3. Check the Spray Arms

• Common Issue: Blocked or jammed spray arms (by spoons, large dishes, etc.), causing a humming or knocking noise.
• Steps:
  • Remove and thoroughly clean the spray arms.
  • Ensure nothing is obstructing the holes and that the arms spin freely.

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4. Examine the Water Inlet Valve

• Common Issue: Humming at the start of the cycle.
• Reason: Valve is clogged or worn, restricting water flow.
• Solution: Replace the water inlet valve if faulty or clogged with mineral deposits.

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5. Properly Load Your Dishwasher

• Improper Loading: Uneven or empty loads can cause unusual noises.
• Tip: Always distribute dishes evenly and avoid blocking the spray arms.

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Conclusion

By checking these common issues, you can resolve most loud humming noises in your dishwasher. If unsure about repairs, consult a professional.

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