Help library: Help library: What are the causes and solutions for the E15 error code?

What are the causes and solutions for the E15 error code?

Troubleshooting Air Purifiers 05/14/2026

<body >
    
<div class="content-service-view" itemtype="HowTo">
      <p class="info-desc description">
        The E15 error code appears on your LG SIGNATURE air purifier's display
        when dust or debris has built up on the Ultra Fine Dust Black Filter.<br/>
        Remove the filter, wash it in warm water with a mild detergent, let it
        dry completely in a shaded area, and then reinstall it to clear the
        error.
      </p>
      
<h2 class="mainName tit">Why does the E15 error code appear?</h2>
      <p>
        The E15 error code appears when the Ultra Fine Dust Black Filter becomes
        dirty and restricts airflow.<br/> This alert helps protect your air purifier
        and maintain its performance.<br/> Simply cleaning the filter thoroughly will
        allow your air purifier to operate normally.
      </p>
      
<h2 class="tit">
        How to clean the Ultra Fine Dust Black Filter to fix the E15 error
      </h2>
      
<div class="HowToStep">
        
<h3 class="name">Step 1. Open the filter tray</h3>
        <p class="text">
          Press the filter tray release button and pull the tray forward.
        </p>        
<div class="img-only">
          <img alt="Press the filter tray open button on the LG Signature air purifier and pull the filter tray forward to open it." src="https://gscs.lge.com:/gscs/support/fileupload/downloadFile.do?fileId=w6ekscU5a1nJ3ZO3nvPtFw&amp;portalId=P1"/>
        </div>
      </div>
      
<div class="HowToStep">
        
<h3 class="name">Step 2. Remove the Ultra Fine Dust Black Filter</h3>
        <p class="text">Carefully remove the dirty filter from the tray.</p>        
<div class="img-only">
          <img alt="Removing the ultra-fine dust collection Black filter from the LG Signature air purifier" src="https://gscs.lge.com:/gscs/support/fileupload/downloadFile.do?fileId=FKGhXkVgeVQQxXRIXYAuw&amp;portalId=P1"/>
        </div>
      </div>
      
<div class="HowToStep">
        
<h3 class="name">
          Step 3. Soak the filter in a mild detergent solution
        </h3>
        <p class="text">
          Mix a mild detergent with warm water (35 °C–40 °C / 95 °F–104 °F).
          Fully submerge the filter and soak it for about 30 minutes to loosen
          the dirt.
        </p>        
<div class="img-only">
          <img alt="Washing an ultrafine dust collection black filter in water with neutral detergent." src="https://gscs.lge.com:/gscs/support/fileupload/downloadFile.do?fileId=fTud7uFfWhiTHj4kx5A&amp;portalId=P1"/>
        </div>
      </div>
      
<div class="HowToStep">
        
<h3 class="name">Step 4. Rinse thoroughly with clean water</h3>
        <p class="text">
          After soaking, rinse the filter thoroughly under running water to
          remove any detergent residue.
        </p>        
<div class="img-only">
          <img alt="Washing an ultrafine dust collection black filter with detergent under clean running water" src="https://gscs.lge.com:/gscs/support/fileupload/downloadFile.do?fileId=mdZWYYrWaYN1ZE82NqjEVg&amp;portalId=P1"/>
        </div>
      </div>
      
<div class="HowToStep">
        
<h3 class="name">Step 5. Dry the filter completely in the shade</h3>
        <p class="text">
          Place the filter at an angle in a well-ventilated, shaded area away
          from direct sunlight. Let it dry completely for 12–24 hours.
        </p>        
<div class="img-only">
          <img alt="A black ultrafine dust collection filter drying upright in the shade." src="https://gscs.lge.com:/gscs/support/fileupload/downloadFile.do?fileId=rq9i3vpDo2jy2HcALgiQSw&amp;portalId=P1"/>
        </div>
      </div>
      
<div class="HowToStep">
        
<h3 class="name">Step 6. Reinstall the filter in the tray</h3>
        <p class="text">
          Once the filter is completely dry, reinstall it, making sure it faces
          the correct direction.
        </p>        
<div class="img-only">
          <img alt="Installing the ultra-fine dust collection Black filter into the filter tray" src="https://gscs.lge.com:/gscs/support/fileupload/downloadFile.do?fileId=vSaEYKpnkYxjZE1O6eyzg&amp;portalId=P1"/>
        </div>
      </div>
      
<div class="HowToStep">
        
<h3 class="name">Step 7. Reattach the filter tray</h3>
        <p class="text">
          Check that the Photocatalyst Deodorizing Black Filter is properly
          installed, then push the tray all the way into the air purifier until
          it is fully closed.
        </p>        
<div class="img-only">
          <img alt="Attaching the filter tray to the LG Signature air purifier" src="https://gscs.lge.com:/gscs/support/fileupload/downloadFile.do?fileId=nDuBvHAApfvs9sKTonoMGg&amp;portalId=P1"/>
        </div>
      </div>

<div class="tip-box qna-list">
        
<h3 class="tip-tit">Frequently Asked Questions (FAQ)</h3>
        <dl>
          <dt>
            
<span aria-label="Question">Q.</span> How often should I clean the
            Ultra Fine Dust Black Filter?
          </dt>
          <dd>
            
<span aria-label="Answer">A.</span> Cleaning frequency may vary
            depending on usage conditions, but we recommend cleaning the filter
            every 1–2 months to maintain optimal performance and help prevent
            the E15 error.
          </dd>
        </dl>
        <dl>
          <dt>
            
<span aria-label="Question">Q.</span> The E15 error still appears
            even after cleaning and fully drying the filter.
          </dt>
          <dd>
            
<span aria-label="Answer">A.</span> Please double-check that the
            filter is facing the correct direction. If the error persists, the
            internal sensor may need inspection. Contact LG Customer Support for
            assistance.
          </dd>
        </dl>
      </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>

</body>
</html>
	
</div>

*Required question

Article Feedback Article Feedback

1. Was this information helpful?*

Please fill out the required field.

YES NO

Need immediate help?

2. How would you improve the information?*

Please fill out the required field.

Characters left : /

Submit

Thank you for your feedback!