Miele DAD 4840 Operating And Installation Instructions page 26

Operation (Automatic mode)
You can also operate the cooker hood
manually for a complete cooking
process.
 Switch the cooker hood fan on
before the hob.
If the cooker hood fan and the hob have
been switched off for at least
30 seconds after cooking, automatic
mode will resume next time the hob is
switched on.
26