it's unlikely that this has happened because you'd see effects on other things in the house. if a bit of water has leaked across a live to neutral/neutral to ground/live to ground link in the grinder it may have blown the internal fuse. if it's a shorted connection of some form, a fuse is going to have blown somewhere either in the house or the machine.
if you're confident with electronics, pull it apart and check the fuse/fuses for continuity. if you find any that are open circuit, be sure to inspect the rest of the electrics for the source of the problem otherwise it might just blow again straight away once replaced.
if it's not just fuses, maybe put up some photo's of where you think the water might have gotten in and onto what it may have leaked. for further repair yourself, without previous experience, your best bet would be to take it to a professional.