If it keeps the door lock on or if it says "Door" in the error message (I think that equates to F05), the pump might be blocked. Pop the bottom plastic cover off (2 inches from left, middle and two inches from right end where there are plastic bendable catches you will need a thin screwdriver to release but be gentle, it folds out in an arc downwards). When the cover is off, unscrew the black circular drain plug (right hand side , have a mop handy as there is always a bit of water) and remove any coins or hair clips. That did the job for me
Stephen Gibney, September 2010