You're probably stacking your dishes too high. When you close the drawer, it attempts to seal it by lowering a lid with rubber seals around the edges. Anything stacked too high means the lid wont seal, water leaks out and you get the F1. If it happens too many times, water will destroy the little motors which close the lid and they will need to be replaced with the new improved sealed versions now available.
Gavin, December 2005