AEG DD 8765 Notice D'utilisation page 60

Filter checking device
The cooker hood is fitted with a device which indicates when the filter
must be cleaned or replaced.
Usually the device, which signals when the carbon filter needs
maintenance work, is deactivated.
To activate it, proceed as follows:
Switch off the cooker hood.
Press and hold the knob for approximately 5 seconds.
The L2 LED begins to flash in green and after approximately 2 seconds
the L2 LED will also begin to flash in orange, to indicate that the
device, which indicates when it is necessary to perform carbon filter
maintenance, has been activated.
L2 LED - grease filter indicator
The LED lights up in green when the grease filter needs to be cleaned;
this happens approximately every 40 hours of operation.
Every time the cooker hood is used, check whether the L2 LED is lit.
L2 LED - carbon filter indicator
The LED lights up in orange when the carbon filter needs to be cleaned/
replaced; this happens approximately every 160 hours of operation.
Every time the cooker hood is used, check whether the L2 LED is lit.
Resetting the filter saturation warning
After cleaning or replacing the filters, switch on the cooker hood at any
suction speed (power), then press and hold the knob for more than 3
seconds, until you hear a beep indicating that the reset procedure has
been performed successfully. The L2 LED and the cooker hood both
switch off.
In some situations (for example, when the L2 LED is indicating that the
grease filters and the carbon filter are saturated), the procedure
described above must be repeated.
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