My Bosch had this fault two weeks ago...
Take out all the filter stuff you can from the bottom of the machine and remove the puddle of water with a cup and an old towel...
In the very bottom of the well on the left you may see a single Torx screw - undo it and remove the plastic cover for the drain pump impeller....
With any luck you will find debris trapped under the blades of the impeller - lemon pips etc... I did and after giving it a little clean up it drained perfectly. The blades rotate freely but you will feel some small magnetic resistance as you turn them.
Good luck...
Peccavi
May 2009