Your Philips Air Purifier comes with multiple layers of filters or a cylindrical filter and warns you when a filter needs to be replaced. Depending on the Philips Air Purifier you have, you might see different types of filter replacement alert lights.
A) Air Purifiers AC400x, AC401x, AC402x, AC407x, AC408x, ACP073x, ACP077x, ACP007x:
• Filter replacement light 1
• Filter replacement light 2
• Filter replacement light 3/4
• Filter replacement light 5
See further explanations below.
B) All other Philips Air Purifiers: Air Purifiers that do not belong to the list mentioned above show a filter replacement indication light, icon or code (models with a display panel) to alert you.
See further explanations below.