LG Dishwasher Making Noise (Troubleshooting Guide)

On this page

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

If your LG dishwasher is making noise, first unplug it and check for loose items. Common causes include a faulty pump, worn bearings, or a loose motor. Replace the affected part if needed.

Confirm the symptom

Dishwasher produces loud or unusual noises during operation
Noise is consistent or occurs during specific cycles
You have an LG dishwasher model

Tools and prep

Screwdrivers (Phillips and flathead)
Work gloves
Flashlight
Owner's manual
Plug in a dry area or use a power strip with on/off switch

Step-by-step troubleshooting

Unplug and Inspect
Do: Unplug the dishwasher and open the door. Check for loose items like dishes, utensils, or foreign objects.
Observe: Any loose items or debris causing the noise
Means: If found, remove the items and reset the dishwasher.
Next: If noise persists, proceed to the next step.
Check the Pump and Motor
Do: Locate the pump and motor (refer to the manual). Listen for grinding or rattling sounds when the dishwasher is plugged in but not running.
Observe: Unusual sounds from the pump or motor area
Means: A faulty pump or motor may be the cause.
Next: Test the pump and motor for damage or wear.
Test the Pump and Motor
Do: Use a multimeter to test the continuity of the pump and motor. Ensure the dishwasher is unplugged before testing.
Observe: No continuity or resistance outside the specified range in the manual
Means: The pump or motor is likely faulty and needs replacement.
Next: Replace the faulty component.
Inspect the Bearings
Do: Remove the outer panel to access the motor bearings. Check for wear, damage, or dryness.
Observe: Worn or dry bearings
Means: The motor bearings may need lubrication or replacement.
Next: Lubricate or replace the bearings as needed.
Check the Drain Hose
Do: Inspect the drain hose for kinks, clogs, or improper installation.
Observe: Kinks or clogs in the drain hose
Means: A restricted drain hose can cause noise during the drain cycle.
Next: Straighten or clear the hose and retest the dishwasher.
Examine the Agitator Arm
Do: Check the agitator arm for obstructions or damage. Ensure it rotates freely.
Observe: Obstructions or damage to the agitator arm
Means: A blocked or damaged agitator arm can create noise during the wash cycle.
Next: Clean or replace the agitator arm if necessary.
Tighten Components
Do: Check all screws and components for tightness, especially around the pump, motor, and door.
Observe: Loose components or screws
Means: Loose parts can vibrate and cause noise.
Next: Tighten any loose components and retest the dishwasher.

Common causes

Cause	Likelihood	Difficulty	Part often needed
Faulty Pump A damaged or worn pump can create loud noises during operation.	Common	Medium	Pump assembly
Worn Motor Bearings Dry or worn motor bearings can cause grinding or rattling sounds.	Common	Medium	Motor assembly
Loose Components Loose screws or parts can vibrate and create noise.	Sometimes	Easy	Screws and hardware
Clogged Drain Hose A kinked or clogged drain hose can cause noise during the drain cycle.	Sometimes	Easy	Drain hose
Damaged Agitator Arm A blocked or damaged agitator arm can create noise during the wash cycle.	Rare	Easy	Agitator arm
Faulty Motor A malfunctioning motor can produce loud or unusual noises.	Rare	Hard	Motor assembly

Parts matching

If you need replacement parts for your LG dishwasher, match your model number to the correct components:

Pump assembly (common part for noise issues)
Motor assembly (for worn bearings or motor failure)
Drain hose (for clogs or kinks)
Agitator arm (if damaged or obstructed)
Screws and hardware (for loose components)

Use your dishwasher's model number to find the exact replacement parts at LG's website or a home appliance parts store.

When to call a professional

Noise persists after replacing all suspected parts
You are unable to locate or access the faulty component
You lack the tools or experience to safely perform the repair
The dishwasher is under warranty and you don't want to risk voiding it
The noise is accompanied by other serious issues like leaks or electrical problems

FAQ

Why is my LG dishwasher making a grinding noise?

A grinding noise is often caused by worn motor bearings or a faulty pump. Check these components for damage or wear.

Can a clogged drain hose cause noise in my LG dishwasher?

Yes, a clogged or kinked drain hose can cause noise during the drain cycle. Clear or replace the hose to resolve the issue.

How do I know if the motor is the source of the noise?

Listen for unusual sounds from the motor area when the dishwasher is plugged in but not running. Test the motor with a multimeter for continuity.

Is it safe to replace the pump or motor myself?

Yes, if you follow the manufacturer's instructions and take proper safety precautions. Ensure the dishwasher is unplugged before starting any repairs.

What should I do if the noise stops temporarily but returns later?

If the noise returns, the underlying issue may not have been fully resolved. Recheck all components or consider professional assistance.