Help Library: Help Library: [LG Air Conditioner Noise] I hear the water flowing sounds from the buried pipe

[LG Air Conditioner Noise] I hear the water flowing sounds from the buried pipe

Troubleshooting Commercial Air Conditioners 16/06/2025

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<body>
    
<div class="content-service-view">
        <p class="info-subject">It is quiet when using the air purification function, but when using the cooling
            function, does the air conditioner generate the water flowing sounds like ‘hissing’, ‘swishing’ or ‘gulping’
            sound?</p>        
<h2 class="tit">Causes and Symptoms</h2>
        
<ul class="cause-list">
            
<li>I hear the sound as the refrigerant(air conditioner gas) moves due to the difference between the
                diameters of the buried pipe and the air conditioner pipe.</li>
        </ul>
        
<h3 class="sub-tit">Checking whether the sound is from the buried pipe</h3>
        <p class="txt-idt">
            1. Press the [Cooling] button to see if the water flowing sound is heard.</p>        <p class="txt-idt">
            2. Press the [MODE] button to enter Fan Mode and check if it makes the following</p>        <p class="txt-idt">
            3. If the sound is heard only when you use the cooling function that makes the refrigerant travel to the
            outdoor unit, then it is from the buried pipes.<br>
            Check the following remedies.
        </p>        
<div class="img-only">
            <img alt="Switch to fan mode when noise occurs during cooling operation" src="https://gscs.lge.com:/gscs/support/fileupload/downloadFile.do?fileId=UOQOM75vLh6m5GU4pQUWnQ&amp;portalId=P1">
        </div>
        <p class="inf-desc">
            Newly constructed building requires burial of pipes for the air conditioner in the wall or floor for
            interior works.<br>
            When the refrigerant moves from the buried pipe with a diameter of 9.52㎟(0.37in) to the air conditioner pipe
            with a much smaller diameter of 6.35㎟(0.25in), it normally speeds up, thus making the water flowing sounds
            like ‘gurgling’ sound.<br>
            When spraying water, if you press the hose entrance and make the passage shallower, then the internal
            pressure is increased and sounds will be louder. This is how it happens.<br>
            If the noise is too loud, check if the noise reduction parts were used for air conditioner installation.
        </p>        
<h2 class="tit">Try this</h2>
        
<h3 class="sub-tit">Do you want to reduce the level of noises from the buried pipes?</h3>
        <p class="info-desc idt">➔ Check with the air conditioner installation company regarding whether noise reduction
            parts for buried pipes were used.<br>
            If you did not use the noise reduction parts, contact an LG Electronics service center.
        </p>        <p>
            If you use the noise reduction parts for buried pipes when installing the air conditioner, you can prevent a
            sudden shrinking of the diameter of the pipe, thus successfully reducing the level of noise.<br>
            There are two different types of parts for LG Electronics air conditioners, namely, for general pipes or
            buried pipes, thus they will be installed accordingly depending on the site situation.<br>
            Check with the air conditioner installation technician or company regarding whether noise reduction parts
            for buried pipes were used.<br>
            If there is something wrong with the part, contact an LG Electronics service center.
        </p>        
<div class="img-only">
            <img alt="Sound of refrigerant flow through buried piping" src="https://gscs.lge.com:/gscs/support/fileupload/downloadFile.do?fileId=PQOPy6gsUIAYQlDVtD3TWA&amp;portalId=P1">
        </div>
        <p class="help-txt">This guide was created for all models, so the images or content may be different from your
            product.</p>    </div>

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Help Library

[LG Air Conditioner Noise] I hear the water flowing sounds from the buried pipe

Causes and Symptoms

Checking whether the sound is from the buried pipe

Try this

Do you want to reduce the level of noises from the buried pipes?

Contact