Possible Cause #1:
Air purifier is operating in manual mode
Solution:
Select your desired operating mode
Possible Cause #2:
Air purifier is operating in Haze / Silent mode
Solution:
Air cleaning level cannot be manually selected in haze / silent mode as it will run at its own set level (minimum level in silent mode, maximum level that is higher than "High" in haze mode)
Possible Cause #3:
Room is too dark - air purifier is operating in sleep mode
Solution:
Air cleaning level is set to a minimum during sleep mode
Possible Cause #4:
Air purifier is in Quick cleaning mode
Solution:
Air cleaning level is set to maximum during Quick cleaning mode