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

When you turn on the air conditioner, it creates airflow in the room, which may cause your air purifier to detect dust or gases. This is normal and does not indicate a malfunction.

Why does my LG air purifier indicator turn red ('Poor') when I turn on my air conditioner? LG USA help image
TroubleshootingAir Conditioners

What to Check First

  1. The air conditioner does not release dust or gases.
  2. Airflow can move dust around, causing your air purifier to detect it.
  3. If the indicator continues to show 'Poor' after extended use, we recommend checking your filter.
  4. Step 1. Turn on a fan in front of the air purifier instead of using the air conditioner.
  5. Step 2. If you see the same change in air quality, the product is operating normally.
  6. Step 3. If the air purifier filter is dirty, clean or replace it.
  7. When you turn on the air conditioner, it creates airflow in the room, which may cause your air purifier to detect dust or gases. This is normal and does not indicate a malfunction.
  8. Your air conditioner repeatedly takes in indoor air, cools it, and releases it back into the room. This creates airflow that can move dust or gases around, causing your air purifier to detect them. Even if the air quality indicator turns red ('Poor'), both units are operating normally.
  9. When only your air purifier is running and the surrounding air is clean, it automatically reduces airflow. As a result, dust or gases do not circulate as much, so the air quality indicator remains at 'Good' (blue).
  10. This guide was created for all models, so the images or content may be different from your product.

Why This Can Happen

Symptoms can have more than one cause, and the correct steps depend on the exact model, installation and operating conditions. Use the checks above to narrow the issue before service.

Safety and Model-Specific Guidance

Stop troubleshooting if you notice burning, electrical damage, unsafe heat, gas odor, refrigerant concerns, or water near electrical components. Follow the official LG USA instructions for your exact model.

Frequently Asked Questions

What should I check first for Why does my LG air purifier indicator turn red ('Poor') when I turn on my air conditioner??

The air conditioner does not release dust or gases.

When should I stop troubleshooting and contact LG?

Stop if the product shows signs of electrical damage, burning, leaking near electrical components, or if the recommended checks do not resolve the issue. Use LG USA support for model-specific service guidance.

Does this guidance apply to every LG model?

Not always. Controls, error codes and service steps can differ by model. Confirm the exact model number and follow the linked LG USA article for model-specific instructions.

Related LG Products

These model pages are linked because the stored category or exact model matches this Help Library topic.

Buying Guides for This Product Type

Household use caseAir Conditioner Family & High-Use Household GuidePerformance & capacityAir Conditioner Performance, Capacity & Everyday-Use GuideEfficiency & running costAir Conditioner Efficiency, Energy & Running-Cost GuideFeatures & valueAir Conditioner Features Worth Paying For — Value Guide

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Read the Official LG Guide