Gtech MULTI POWER FLOOR ATF049 Manuel D'utilisation page 46

If the suction is low when the bin is empty and filter is clean...
you have a blockage.
Remove the battery & bin from the body
and look through both ends of the tube.
Remove any blockages.
The extension floor tube and crevice tool can sometimes block too.
46
The powered floor head can also
get blocked. To check for blockages
thoroughly, remove the brush bar.
(See page 44)