LG Dishwasher Making Whining Noise (Troubleshooting Guide)

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Quick answer
Confirm the symptom
Tools and prep
Step-by-step troubleshooting
Common causes table
Parts matching
When to call a pro
FAQ
Related guides

Quick answer

A whining noise in your LG dishwasher often comes from the motor or pump. Start by checking for foreign objects in the drain pump and ensuring the unit is level. If the noise persists, the motor or pump may need replacement.

Confirm the symptom

High-pitched whining or squealing noise during operation
Noise increases during the wash or drain cycle
No visible blockages in the filter or spray arms

Tools and prep

Screwdriver (Phillips and flathead)
Work gloves
Flashlight
Plastic putty knife
LG dishwasher manual
Turn off power at the circuit breaker
Turn off water supply

Step-by-step troubleshooting

Check for Foreign Objects
Do: Remove the lower rack and inspect the drain pump area for small objects or debris.
Observe: Find and remove any foreign objects.
Means: Objects can cause the pump to whine.
Next: If no objects are found, proceed to the next step.
Inspect the Drain Pump
Do: Locate the drain pump (usually at the bottom of the dishwasher) and visually check for damage or wear.
Observe: Look for cracks, corrosion, or worn bearings.
Means: A damaged pump can create a whining sound.
Next: If the pump is damaged, consider replacing it.
Check the Dishwasher Level
Do: Use a level to ensure the dishwasher is evenly balanced on the floor.
Observe: The dishwasher tilts to one side.
Means: An unlevel unit can strain internal components.
Next: Adjust the feet to level the dishwasher.
Test the Motor
Do: Listen closely to determine if the noise comes from the motor or pump during operation.
Observe: The noise is loudest near the motor area.
Means: A failing motor may need replacement.
Next: If the motor is the source, contact a professional.
Inspect the Drive Belt
Do: If your model has a belt, check for looseness or wear.
Observe: The belt is frayed or slipping.
Means: A worn belt can cause unusual noises.
Next: Replace the belt if damaged.
Check the Water Inlet Valve
Do: Inspect the water inlet valve for mineral buildup or damage.
Observe: The valve is clogged or leaking.
Means: A faulty valve can cause operational noise.
Next: Clean or replace the valve as needed.

Common causes

Cause	Likelihood	Difficulty	Part often needed
Foreign Objects in Drain Pump Objects can cause the pump to vibrate or bind, creating a whining noise.	Common	Easy	Drain pump (if damaged)
Damaged Drain Pump Worn or corroded pump components can create high-pitched noises.	Common	Medium	Drain pump
Unlevel Dishwasher An uneven unit can strain internal parts, leading to noise.	Sometimes	Easy	None
Failing Motor A motor with worn bearings can produce a whining sound.	Sometimes	Hard	Motor assembly
Worn Drive Belt A loose or damaged belt can cause noise during operation.	Rare	Easy–Medium	Drive belt
Clogged Water Inlet Valve Mineral deposits can restrict water flow and cause noise.	Sometimes	Easy–Medium	Water inlet valve

Parts matching

If you need to replace parts, match these components to your LG model:

Drain Pump (Part #AP3010975)
Motor Assembly (Part #AP3010974)
Drive Belt (Part #AP3010976)
Water Inlet Valve (Part #AP3010977)

Use your full model number (e.g., LG LDF6920ST) to find the correct replacement parts.

When to call a professional

The noise persists after checking all common causes
You identify a damaged motor or pump but lack the tools to replace it
You're unsure about electrical components or motor replacement
The dishwasher is under warranty and you don't want to risk voiding it

FAQ

Can a clogged filter cause a whining noise?

A clogged filter typically causes slow drainage or bad odors, not a whining noise. Focus on the pump and motor areas instead.

Is it safe to run the dishwasher if it's making a whining noise?

It's not recommended, as the noise may indicate a failing component that could worsen with use.

How do I know if the motor is bad?

If the noise is loudest near the motor and the dishwasher isn't draining properly, the motor may be failing.

Can I replace the drain pump myself?

Yes, if you're comfortable with basic tools and following the manual. Otherwise, call a professional.