Paul,
the problem is the door catch is not fully connecting with the pressure switch inside the door. we repaired ours by removing the door catch and putting a block under it (a couple of washers will do) to allow it to fully meet the pressure switch. Be careful when removing the screws on the door catch as the plate inside the cavity can move out of allignment then you need to remove the outer cover of the whole machine to replace the plate. One trick maybe to partially undo one screw then fully undo the other inset the washer (or what ever you want to use as a block) then replace the screw before doing the same to the other screw. Also you may find you need to use longer screws as the block may prevent the existing screws from fully engaging the plate.
Hope that this helps.
Regards and best of luck
Brian
Brian, March 2008