Recently bought my self a 118d, after having it a few months iv noticed that the air vents wont switch positions... weather its directing air to the windscreen, my feet or the centre vents. pressing the electronic contol button does nothing at all, even when i removed the large centre vent the vent doors dont move at all there always jammed shut

The light on the contol comes on, showing that it should be blowing air out the centre vents but nothing at all,

is there a seprate fuse for the vent doors ??