Help library: Help library: Why does my LG air purifier indicator turn red ('Poor') when I turn on my air conditioner?

Why does my LG air purifier indicator turn red ('Poor') when I turn on my air conditioner?

Troubleshooting Air Purifiers 07/07/2026

<body >
    
<div class="content-service-view" itemtype="HowTo">
      <p class="info-desc description">
        When you turn on the air conditioner, it creates airflow in the room,
        which may cause your air purifier to detect dust or gases. <br/>
        This is normal and does not indicate a malfunction.
      </p>      
<div class="img-only">
        <img src="https://gscs.lge.com:/gscs/support/fileupload/downloadFile.do?fileId=8QnzTDKunMOWgSLD6gBeZQ&amp;portalId=P1" alt="When your air conditioner is running, increased airflow can move dust and gases closer to your air purifier, causing the air quality indicator to change to 'Very Poor'."/>
      </div>
      
<h2 class="warn-tit">Please note</h2>
      
<ul class="bul-list">
        
<li>The air conditioner does not release dust or gases.</li>
        
<li>
          Airflow can move dust around, causing your air purifier to detect it.
        </li>
        
<li>
          If the indicator continues to show 'Poor' after extended use, we
          recommend checking your filter.
        </li>
      </ul>
      
<h2 class="mainName tit">
        Why does your air purifier indicator change when the air conditioner is
        on?
      </h2>
      <p>
        Your air conditioner repeatedly takes in indoor air, cools it, and
        releases it back into the room.<br/>
        This creates airflow that can move dust or gases around, causing your
        air purifier to detect them.<br/>
        Even if the air quality indicator turns red ('Poor'), both units are
        operating normally.
      </p>      
<div class="HowToStep">
        
<h3 class="name">
          1. What happens when you only use your air purifier?
        </h3>
        <p class="text">
          When only your air purifier is running and the surrounding air is
          clean, it automatically reduces airflow.<br/>
          As a result, dust or gases do not circulate as much, so the air
          quality indicator remains at 'Good' (blue).
        </p>      </div>
      <br/><br/>
      
<div class="HowToStep">
        
<h2 class="tit name">Try this</h2>
        
<ol class="text">
          
<li>
            Step 1. Turn on a fan in front of the air purifier instead of using
            the air conditioner.
          </li>
          
<li>
            Step 2. If you see the same change in air quality, the product is
            operating normally.
          </li>
          
<li>
            Step 3. If the air purifier filter is dirty, clean or replace it.
          </li>
        </ol>
      </div>

<h2 class="tit">Frequently Asked Questions (FAQ)</h2>
      
<div class="tip-box qna-list">
        <dl>
          <dt>
            
<span role="img" aria-label="Question">Q.</span> Do I need to check
            the air purifier if its indicator stays red?
          </dt>
          <dd>
            
<span role="img" aria-label="Answer">A.</span> If the “Poor” status
            continues for an extended period, check the filter and the
            surrounding environment (such as smoking or cooking).
          </dd>
        </dl>
        <dl>
          <dt>
            
<span role="img" aria-label="Question">Q.</span> When does dust come
            from the air conditioner?
          </dt>
          <dd>
            
<span role="img" aria-label="Answer">A.</span> This may occur if the
            filter is dirty or hasn't been cleaned in a while.<br/>
            If the issue continues after cleaning the filter, 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>

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Why does my LG air purifier indicator turn red ('Poor') when I turn on my air conditioner?

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