My Philips Air Purifier's air quality ring colour does not change

The air quality sensor (D in the image below) needs to be clean and dry for your air purifier to work properly and for the ring to provide the correct indications.

Please clean the air quality sensor with moistened cotton buds and then dry it with dry cotton buds.

When polluted air continues entering your room, then the air that has been cleaned by your air purifier will be replaced by new polluted air. Due to this, the air quality ring light in your Philips Air Purifier won't change.

Please check the quality of the air outside the room (you can do this using Air Matters or a similar app). If the quality of the air outside is bad, make sure to close all windows so the air that is purified does not become polluted again.

New furniture can emit gases for several weeks. These gases would be sensed by the air quality sensor and the quality ring light will not change.