There are no lights on the panel of my Blue Pure Max but the fan seems to be working

If the lights are off but the fan seems to be working as normal, you may need to adjust the Brightness of the light indicators on your device:

1. Simultaneously press and hold the fan speed and On/Standby buttons for three seconds.
2. While still holding the On/Standby button, tap the fan speed button to increase or decrease the Brightness.

Note: Each tap increases or decreases the brightness level.