LG Dishwasher Making High Pitch Noise

Quick answer

A high-pitched noise from your LG dishwasher is often caused by a faulty water inlet valve or a loose component. Turn off the power, check for loose parts, and replace the valve if needed.

Confirm the symptom

• High-pitched whining or humming noise during operation
• Noise occurs only when the dishwasher is running
• Noise is not coming from the drain pump or garbage disposal

Tools and prep

• Screwdriver set
• Multimeter
• Plumber's tape
• Work gloves
• LG dishwasher user manual
• Turn off power at the circuit breaker
• Turn off water supply to the dishwasher

Step-by-step troubleshooting

1. Check for Loose Components
   Do: Open the dishwasher and inspect the interior for loose racks, dishes, or components.
   Observe: Look for any items that may be vibrating or rubbing against the walls.
   Means: Loose items can cause high-pitched noises when they vibrate.
   Next: If loose items are found, secure or remove them and restart the dishwasher to see if the noise stops.
2. Inspect the Water Inlet Valve
   Do: Locate the water inlet valve at the back of the dishwasher and check for damage or mineral buildup.
   Observe: Look for cracks, leaks, or debris blocking the valve.
   Means: A faulty or clogged water inlet valve can cause high-pitched noises during water intake.
   Next: If the valve is damaged or clogged, replace it following the manufacturer's instructions.
3. Test the Water Inlet Valve
   Do: Use a multimeter to test the water inlet valve for continuity.
   Observe: If the valve does not have continuity, it is faulty.
   Means: A faulty water inlet valve can cause high-pitched noises when the dishwasher tries to fill with water.
   Next: Replace the water inlet valve if it is faulty.
4. Check the Drain Pump
   Do: Locate the drain pump and listen for any unusual noises when the dishwasher is draining.
   Observe: Listen for grinding or high-pitched noises coming from the drain pump.
   Means: A faulty drain pump can cause high-pitched noises during the draining cycle.
   Next: If the drain pump is faulty, it may need to be replaced by a professional.
5. Inspect the Motor
   Do: Listen closely to the motor during operation to identify any high-pitched noises.
   Observe: Look for any signs of wear or damage to the motor.
   Means: A worn or damaged motor can cause high-pitched noises during operation.
   Next: If the motor is damaged, it may need to be replaced by a professional.
6. Check for Air in the Water Line
   Do: Turn on the water supply and let the dishwasher run to see if air is being drawn into the system.
   Observe: Listen for any hissing or whining noises that may indicate air in the water line.
   Means: Air in the water line can cause high-pitched noises during operation.
   Next: If air is present, check the water supply line for leaks or loose connections and repair as needed.

Common causes

Parts matching

Common parts needed to fix an LG dishwasher making a high-pitched noise include:

• Water Inlet Valve
• Drain Pump
• Filter
• Motor

Always refer to your LG dishwasher's user manual for specific part numbers and compatibility.

When to call a professional

• The high-pitched noise persists after replacing the water inlet valve
• You hear grinding or loud noises from the motor or drain pump
• You are unsure about electrical testing or component replacement
• The dishwasher is under warranty and you don't want to risk voiding it
• You detect a water leak or significant damage

FAQ

Related guides

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