Why Is My Dishwasher Making a Humming Noise

Quick answer

A humming noise in your dishwasher often indicates a problem with the motor or pump. Check for obstructions in the pump and ensure the unit is properly level. If the noise persists, the motor may need repair or replacement.

Confirm the symptom

• The noise is a continuous hum during the wash cycle
• The dishwasher is not heating water properly
• The humming occurs even when the dishwasher is empty

Tools and prep

• Screwdrivers (flathead and Phillips)
• Flashlight
• Work gloves
• Plumber's putty (if checking for leaks)
• Owner's manual for your dishwasher model
• Turn off the power at the circuit breaker before starting

Step-by-step troubleshooting

1. Check for Obstructions
   Do: Remove the lower rack and inspect the pump area for food particles or debris.
   Observe: Any blockage in the pump or drain hose.
   Means: Debris can cause the motor to strain, resulting in a humming noise.
   Next: Clean the pump and drain hose if obstructions are found.
2. Verify Dishwasher Level
   Do: Use a level to check if the dishwasher is sitting evenly on the floor.
   Observe: The dishwasher is tilted to one side.
   Means: An unlevel dishwasher can cause the motor to work harder and produce a hum.
   Next: Adjust the leveling legs to ensure the unit is level.
3. Inspect the Motor
   Do: Listen closely to the motor while the dishwasher is running.
   Observe: The motor is making a loud humming noise without spinning.
   Means: The motor may be failing or the motor bearings may be worn out.
   Next: If the motor is faulty, consider replacing it or contacting a professional.
4. Check the Water Supply
   Do: Ensure the water supply valve is fully open and there are no kinks in the water inlet hose.
   Observe: Low water pressure or restricted flow.
   Means: Inadequate water supply can cause the dishwasher to strain and hum.
   Next: Adjust the water supply or replace the inlet hose if damaged.
5. Test the Door Latch
   Do: Check if the door is closing securely and the latch is functioning properly.
   Observe: The door is not latching fully or is misaligned.
   Means: A faulty door latch can prevent the dishwasher from starting correctly, causing a hum.
   Next: Adjust or replace the door latch if necessary.
6. Examine the Circulation Pump
   Do: Inspect the circulation pump for signs of wear or damage.
   Observe: The pump is clogged or the impeller is not spinning freely.
   Means: A faulty circulation pump can cause the dishwasher to hum.
   Next: Clean the pump or replace it if damaged.
7. Check for Electrical Issues
   Do: Ensure the dishwasher is properly plugged in and there are no tripped circuit breakers.
   Observe: The power supply is unstable or interrupted.
   Means: Electrical issues can cause the motor to hum without running.
   Next: Reset the circuit breaker or check the power cord for damage.

Common causes

Parts matching

Common parts needed to fix a humming dishwasher include:

• Pump filter
• Drain hose
• Leveling legs
• Motor assembly
• Water inlet valve
• Door latch assembly
• Circulation pump

Always refer to your dishwasher's manual to ensure you're using the correct replacement parts for your specific model.

When to call a professional

• The humming noise persists after cleaning the pump and drain hose
• The dishwasher motor is not spinning despite no visible obstructions
• You suspect electrical issues and are unsure how to safely address them
• The dishwasher is not heating water even after checking the water supply
• The noise is accompanied by a burning smell or smoke
• You are uncomfortable working with electrical components or motor parts

FAQ

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