See also:

Lights
Display messages about LEDs: This display message will only appear if all LEDs have failed. Display messages Possible causes/consequences and •► Solutions Check Left Corneri ...

Changing batteries
Batteries are required for the remote control and for the two sets of cordless headphones. Changing batteries. ...

Important safety notes
WARNING Severe conditions (e.g. strong air pollution) may require replacement of the filter before its scheduled replacement interval. A clogged filter will reduce the air volume to the inter ...