Lg Dishwasher Making a Whistling Noise- How to Troubleshoot

lg dishwasher
As an Amazon Associate, we earn from qualifying purchases at no extra cost to you.

During a routine cleaning, the LG dishwasher can make a whistling noise, which can be annoying. The sound produced may be so loud that it disturbs those in the vicinity.

The dishwasher’s high and odd noise signals that it has some failing parts that need to be replaced before a major problem arises. When the dishwasher makes unusually loud whistling noises, it’s crucial to address the problem yourself before calling a plumber.

The following article explains the most common causes of high pitch noise in dishwashers and provides a step-by-step strategy for diagnosing such issues without difficulty.

The causes of the whistling noise in the LG dishwasher and how to remedy it

lg dishwasher making whistling noise

During the washing cycle, the LG dishwasher will generate some loud whistling noises. Some of the issues that could be creating the noise are simple to identify and troubleshoot on one’s own. Some of the causes of whistling noises in LG dishwashers are listed below.

1. The water supply to the LG dishwasher machine is insufficient

The water supply to the LG dishwasher machine is insufficient because of water intent valve

When there isn’t enough spraying water in the washer during a cycle, the washer will make some noises. First, inspect the dishwasher parts for any flaws once the water spraying in the dishwasher has decreased. After you’ve figured out what’s causing the high-pitched noise, follow the procedures below to fix the low water supply problem.

  • Some components, such as the water inlet valve, must be thoroughly examined to see whether they are in excellent working order or damaged. Remove any dirt or organic matter that has clogged the water inlet valve using a fine brush.
  • To remove any trapped material, flush distilled vinegar down the inlet valve. Allow the distilled vinegar to sit for a few seconds, maybe thirty minutes.
  • Flush clean water down the water inlet valve to flush out any remaining vinegar.
  • If the high pitch noise persists, seek assistance by taking the dishwasher to a local repair shop or considering replacing the entire dishwasher.

2. Dishwasher motor failure

Dishwasher motor failure

To begin, test the wash motor by turning on the dishwasher and listening for a high-pitched noise. A bad motor will make a rattling noise, whereas a good motor will work normally. Because the cost of a new motor is roughly the same as the cost of the entire motor, the only method to troubleshoot a faulty motor is to replace the entire dishwasher.

Get a New Motor From Amazon.

3. The ventilation fan has been damaged

damaged Dishwasher ventilation fan

Due to a defective fan, the Lg dishwasher ventilation fan may occasionally create a high pitch noise. If you follow the advised methods below, diagnosing the ventilation fan issue will be simple. Gather all supplies required to repair the faulty ventilation fan.

  1. Disconnect the dishwasher and locate the ventilation fan inside the appliance.
  2. Perform a thorough inspection of the ventilation fan to identify any issues. Consider moving on to the next stage if there are any flaws.
  3. If any dust or debris has accumulated on the fan, clean it with a vacuum cleaner.
  4. Check the ventilation fan after cleaning to see if the noise is gone. Replace the ventilation fan with an original if the problem persists.

4. The pump for circulation is not working properly

When the dishwasher motor bearings fail, low water pressure is released, causing a high-pitched noise to be emitted through the spray arm. A faulty circulation pump is fixed by replacing it with a new one compatible with the dishwasher model.

5. Spray arms that are loose

Spray arms that are loose

During the spinning cycle, loose spray arms knock against each other, emitting a high-pitched noise. To avoid damaging the spray arm and shattering the dishes, it’s best to solve the problem right away. Follow the procedures below to resolve the issue:

  • To eliminate the banging sounds, arrange the dishes in an organized manner.
  • To keep the loose spray arm from striking the dishes, tighten it.
  • If the problem persists, hire a professional plumber to assist you in resolving the issue.

A foreign object in the dishwasher pump may cause the pump to stop rotating freely. The issue usually arises during the cleaning procedure, and elements that can clog the pump include residual foods that turn into organic garbage over time, broken crockery, etc.

Rather than ignoring a weird noise while doing the dishes, consider correcting it immediately away. Follow the procedures described below to successfully address the issue. Before moving on to the following step, make sure the dishwasher is turned off.

  • Determine where the dishwasher pump is located.
  • Listen to the dishwasher to see if it makes a high-pitched noise. Proceed to the following step if the noise is created.
  • Open the dishwasher door for a few minutes to hear if the high-pitched noise is present.
  • Leave the dishwasher door open for a few minutes to let the steam escape. To avoid harming the bottom rack, carefully remove it.
  • Thoroughly search the pump for any obstructing substances, such as organic material.
  • Remove the obstructing substances with a thin brush or an old hairbrush. To avoid damaging the pump, gently remove the blocking items.
  • Flush the pump with clean water and double-check for any remaining blocking substance before moving on to the next step.
  • After locating the dishwasher screen, disconnect it. It’s hidden beneath the spray arm.
  • Clean out any organic matter from the screen and filter. To eliminate any residual food grease, clean both the screen and the filter with warm water and the prescribed detergent or soap.
  • Clean all dirt and organic debris from the pump housing cap and food disposer blade.
  • Start the dishwasher and check to see if the pump is working properly. If not, enlist the assistance of a qualified technician.

Frequently asked questions:

  • Are there belts in dishwashers?

The belt is wrapped around a pulley at the pump assembly’s base and a pulley at the motor’s base. The engine will most likely be on the right, and the pump assembly will be in the middle. To remove and repair the dishwasher’s belt, you do not need to remove it from the wall.

  • How does a faulty dishwasher pump sound?

The hiss of water coming through the water input fill valve, the hum of the pump engine, or the slosh of water is all standard dishwasher noises. The wash pump or drain pump may make a loud buzzing noise. When the bearings in the wash pump motor wear down, it squeals or whines.

  • What is the source of the knocking sound from the water pipes?

Variable water pressure in the main supply pipes coming into your home is the most common cause of knocking pipes. When the air used to pressurize such pipes breaks or runs out, water rushes quickly and forcefully, making a banging sound as it passes through the supply lines.


In the daily life of washing, the LG dishwasher is a necessary and useful device. During normal operation, the dishwasher may occasionally generate noises such as whistling noises. If your dishwasher makes these kinds of loud noises, follow the steps in this article to determine the cause of the problem and, if possible, troubleshoot it.

The dishwasher is cleaned regularly to remove any materials or debris that could cause it to break down. To extend the life of your dishwasher, follow the owner’s user handbook for proper cleaning and maintenance.

Related Article:

Leave a Comment