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

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.
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.

Why does the E15 error code appear?

The E15 error code appears when the Ultra Fine Dust Black Filter becomes dirty and restricts airflow.
This alert helps protect your air purifier and maintain its performance.
Simply cleaning the filter thoroughly will allow your air purifier to operate normally.

How to clean the Ultra Fine Dust Black Filter to fix the E15 error

Step 1. Open the filter tray

Press the filter tray release button and pull the tray forward.

Step 2. Remove the Ultra Fine Dust Black Filter

Carefully remove the dirty filter from the tray.

Step 3. Soak the filter in a mild detergent solution

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.

Step 4. Rinse thoroughly with clean water

After soaking, rinse the filter thoroughly under running water to remove any detergent residue.

Step 5. Dry the filter completely in the shade

Place the filter at an angle in a well-ventilated, shaded area away from direct sunlight. Let it dry completely for 12–24 hours.

Step 6. Reinstall the filter in the tray

Once the filter is completely dry, reinstall it, making sure it faces the correct direction.

Step 7. Reattach the filter tray

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.

This guide was created for all models, so the images or content may be different from your product.