1, the air quality is poor, and the indicator light is always red, indicating that the current air quality is poor. The air quality detector at the air inlet of the air purifier will light up a red light when it finds that the air quality is poor, prompting the user of the current air temperature difference.

2. There is too much dust on the filter screen. Another situation is that the air purifier has been used for a long time, and a lot of dust has been deposited on the internal filter screen. The system has the function of automatically prompting to replace the filter. If the filter screen is dusty, just replace or clean the filter screen.