While LG dishwashers are designed to operate quietly, different noise can occur periodically while the unit is in operation. While some noise can be concerning, most are considered part of normal operation.
Rattling noise can be caused by improperly loaded dishes or a loose or clogged filter.
Ensure the dishwasher is properly loaded. Utensils hanging out of the rack can hit the spray nozzles or other dishes while a cycle is running. Moving dishes around in the racks so they are secure can prevent this from happening.
If the drain filter is clogged or has not been inserted properly, it can rattle or shake during the cycle. If the filter is dirty or clogged, clean it and reinsert the filter securely and try again.
If the noise continues after adjusting the dishes and the filter, try running an empty cycle. If still occurring, please visit our Request a Repair page to schedule service.
Broken or faulty circulation pump motors tend to make a loud squealing or grinding (metal rubbing against metal) sound. The noise is generally caused by worn-out or rusty bearings. Bearings cannot be individually replaced. The entire circulator pump assembly will require replacement to eliminate the noise.
Grinding noise can also be caused by the drain pump that pumps the water out of the appliance into the drain. The persistent noise could indicate a clogged or defective drain pump. Verify whether the drain hose could be blocked. If not, then the pump is most likely defective. It is likely the motor is vibrating too much. If the grinding persists and the sound gets worse, the dishwasher will require a repair service.
When starting a cycle, should you notice a loud screeching sound in the first few minutes, that is usually a sign the water inlet valve has worn out or broken and needs to be replaced.
When water is drawn into the unit a whistling noise can be heard. If the water volume is too high the whistling noise will be louder.
It may be necessary to adjust the tap opening to reduce the water volume supplied to the product.
Depending on the cycle selected, the sound can be air being pulled through to clean the filter.
This can also be caused if too much detergent is being used or the incorrect detergent is being used. Ensure you are using the correct detergent and correct amounts based on the cycle selected.
This is a high temperature alarm. After opening the door, the high temp alarm will sound immediately following a steam, heated wash, rinse, or dry cycle.
The buzzing sound will alert you if there are high temperatures inside the washer.
If you hear beeping noises and an error code is displayed on the control panel, please see our LG Dishwasher - Error Codes article for further assistance.
Humming noise can be heard from the drain pump, vario motor, and direct drive motor when they activate and run.
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