Help library: Help library: Why doesn’t the odor level change even when the air purifier smells?

Why doesn’t the odor level change even when the air purifier smells?

Troubleshooting Air Purifiers 06/26/2026

<body >
    
<div class="content-service-view" itemtype="HowTo">
      <p class="description">
        If you notice an odor from the air purifier but the odor level indicator
        does not change, it may be due to certain substances the sensor cannot
        detect. <br/>
        Test the odor sensor to make sure it is working properly.
      </p>
      
<h3 class="warn-tit">Important</h3>
      
<ul class="bul-list">
        
<li>
          If the odor level still does not change after testing, the unit may
          need an inspection by a qualified service technician.
        </li>
      </ul>

<h2 class="mainName tit">
        Why doesn’t the odor level change even when the odor sensor is working
        properly?
      </h2>
      <p>
        The human nose can detect hundreds of thousands of odors, but the odor
        sensor only responds to specific gases like carbon monoxide, propane,
        and ammonia. <br/>
        As a result, the odor sensor may not detect certain substances that do
        not react with oxygen, such as food odors, so the odor level on the
        indicator may not change.
      </p>
      
<h2 class="tit">
        How can I check if the odor sensor is working properly?
      </h2>
      
<ol>
        
<li class="txt-idt">
          1. Apply a small amount of perfume, vinegar, or air freshener to a
          tissue and hold it near the odor sensor.
        </li>
        
<li class="txt-idt">
          2. If the odor level indicator on the control panel changes color, the
          sensor is working properly.
        </li>
      </ol>

<div class="HowToStep">
        
<h3 class="name">1. Wall‑mounted air purifier (Wall-Fit model)</h3>
        <p class="text">
          Inside the front filter case, on the upper right side.
        </p>        
<div class="img-only">
          <img src="https://gscs.lge.com:/gscs/support/fileupload/downloadFile.do?fileId=l9J7exoVMV4btGf3Z7qOg&amp;portalId=P1" alt="The image shows that the gas sensor of the Wallfit air purifier is located at the top right inside the front filter case."/>
        </div>
      </div>

<div class="HowToStep">
        
<h3 class="name">2. LG PuriCare&trade; AeroTower</h3>
        <p class="text">Inside the rear filter case</p>        
<div class="img-only">
          <img src="https://gscs.lge.com:/gscs/support/fileupload/downloadFile.do?fileId=Uv5Z1yznEnybEvQKVVQHQ&amp;portalId=P1" alt="The AeroTower gas sensor is located inside the filter case on the back of the product."/>
        </div>
      </div>

<div class="HowToStep">
        
<h3 class="name">3. Mont Blanc P model</h3>
        <p class="text">Inside the rear filter case</p>        
<div class="img-only">
          <img src="https://gscs.lge.com:/gscs/support/fileupload/downloadFile.do?fileId=zWUZqrco2XectmWBUExzw&amp;portalId=P1" alt="Location and appearance of the dust sensor on the Montblanc P model"/>
        </div>
      </div>

<div class="HowToStep">
        
<h3 class="name">4. Mont Blanc S model</h3>
        <p class="text">Upper rear side</p>        
<div class="img-only">
          <img src="https://gscs.lge.com:/gscs/support/fileupload/downloadFile.do?fileId=Gg1zzBnpmUiIlSY5gpsDLA&amp;portalId=P1" alt="Location and appearance of the dust sensor on the Montblanc S model"/>
        </div>
      </div>

<div class="HowToStep">
        
<h3 class="name">5. PuriCare 360 (Mont Blanc D)</h3>
        <p class="text">Inside the rear filter case</p>        
<div class="img-only">
          <img src="https://gscs.lge.com:/gscs/support/fileupload/downloadFile.do?fileId=SHWkw7MXhwOZftq3ILEAA&amp;portalId=P1" alt="Location and appearance of the dust and gas sensors on the PuriCare 360 (Montblanc D) model"/>
        </div>
      </div>

<div class="HowToStep">
        
<h3 class="name">6. PuriCare Mini (Mont Blanc M)</h3>
        <p class="text">Bottom center on the rear side</p>        
<div class="img-only">
          <img src="https://gscs.lge.com:/gscs/support/fileupload/downloadFile.do?fileId=85NKKsvc9OuAa0HiOWYjA&amp;portalId=P1" alt="Location and appearance of the dust sensor on the PuriCare Mini (Montblanc M) model"/>
        </div>
      </div>

<div class="HowToStep">
        
<h3 class="name">7. LG SIGNATURE</h3>
        <p class="text">Inside the rear filter tray</p>        
<div class="img-only">
          <img src="https://gscs.lge.com:/gscs/support/fileupload/downloadFile.do?fileId=auPFAICKlINvsLzBW2XZsg&amp;portalId=P1" alt="Location and appearance of the dust, gas, and humidity sensors on the LG signature model"/>
        </div>
      </div>

<div class="HowToStep">
        
<h3 class="name">
          8. Objet Collection (gas/humidity sensor, dust sensor)
        </h3>
        <p class="text">Upper left on the rear side</p>        
<div class="img-only">
          <img src="https://gscs.lge.com:/gscs/support/fileupload/downloadFile.do?fileId=X5QCTRleE6oxAIt32MQQ&amp;portalId=P1" alt="Location and appearance of the dust sensor and gas/humidity sensor on the objet collection model"/>
        </div>
      </div>
      
<div class="HowToStep">
        
<h3 class="name">9. Mont Blanc B model</h3>
        <p class="text">Inside the front filter case</p>        
<div class="img-only">
          <img src="https://gscs.lge.com:/gscs/support/fileupload/downloadFile.do?fileId=A8PqLHxheXkDdxu5DV7gA&amp;portalId=P1" alt="Location and appearance of the dust sensor on the Montblanc B model"/>
        </div>
      </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> Can I clean the
            odor sensor?
          </dt>
          <dd>
            
<span role="img" aria-label="Answer">A.</span> Gently wipe the
            sensor surface with a slightly damp cotton swab.
          </dd>
        </dl>
        <dl>
          <dt>
            
<span role="img" aria-label="Question">Q.</span> The odor level
            changes too frequently.
          </dt>
          <dd>
            
<span role="img" aria-label="Answer">A.</span> The sensor is highly
            sensitive and may react to changes in surrounding gas levels,
            perfumes, or air fresheners.
          </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 doesn’t the odor level change even when the air purifier smells?

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