Dishwasher Making a Humming Noise

Quick answer

A humming dishwasher often indicates a faulty motor or circulation pump. Turn off the power, check for clogs, and test the motor. Replace the motor or pump if necessary.

Confirm the symptom

• Dishwasher makes a continuous humming sound
• Humming occurs during wash or drain cycles
• No water flows despite the humming noise
• Dishwasher does not start or advance cycles

Tools and prep

• Screwdrivers (flathead and Phillips)
• Multimeter for testing electrical components
• Work gloves and safety goggles
• Plumber's putty or sealant if resealing
• Bucket (for water catchment if needed)
• Owner’s manual for part diagrams

Step-by-step troubleshooting

1. Turn Off Power and Water
   Do: Shut off the circuit breaker for the dishwasher and close the water supply valve.
   Observe: Power and water are disconnected to prevent injury.
   Means: Safety is ensured for inspection.
   Next: Check for visible clogs in the drain pump and filter.
2. Inspect the Drain Pump and Filter
   Do: Remove the lower rack and access panel to inspect the drain pump and filter for debris.
   Observe: Clogged filter or pump may restrict water flow.
   Means: Clogs can cause the motor to hum without functioning.
   Next: Clean the filter and pump if clogged.
3. Test the Motor and Pump
   Do: Use a multimeter to test the motor and circulation pump for continuity.
   Observe: No continuity indicates a faulty component.
   Means: The motor or pump is likely the issue.
   Next: Replace the faulty motor or pump.
4. Check the Water Inlet Valve
   Do: Inspect the water inlet valve for blockages or electrical failure.
   Observe: If the valve is not opening, water won’t flow.
   Means: A faulty valve can prevent operation.
   Next: Replace the water inlet valve if defective.
5. Examine the Door Latch and Switch
   Do: Ensure the door is fully closed and test the door switch for continuity.
   Observe: A faulty door switch may prevent the dishwasher from starting.
   Means: The dishwasher may hum but not activate.
   Next: Replace the door switch if necessary.
6. Test the Control Board
   Do: Inspect the control board for visible damage or error codes.
   Observe: Error codes or burn marks suggest a malfunction.
   Means: The control board may need replacement.
   Next: Consult the manual or a professional for control board issues.

Common causes

Parts matching

Common parts needed for a humming dishwasher include:

• Dishwasher Motor
• Circulation Pump
• Water Inlet Valve
• Door Switch
• Control Board
• Filter Assembly

Refer to your dishwasher’s model number to order the correct replacement parts.

When to call a professional

• The humming persists after replacing the motor and pump
• You detect a burning smell or sparks during testing
• The control board shows error codes you can’t resolve
• You’re unsure about electrical testing or part installation
• Water leaks occur after attempting repairs

FAQ

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