DON'T leave the dishwasher closed/locked the whole time you're away!
Someone told us about this, but we forgot one time, and ran the dishwasher as we were walking out the door for a 7 day trip to WDW. Luckily, the dishwasher didn't leak (though now that I think about it, we shouldn't have started it right before we left).
But even though it didn't leak or have any other problems, when we got back and opened it, the dishes had MOLD on them - seems the moist dark environment of a closed dishwasher is a breeding ground for mold.
So if you run the dishwasher, or even have dishes in it before you leave, leave the door to the dishwasher opened a bit while you're away.
Maybe this only applies to running the dishwasher right before you leave, andleaving it shut up during the trip - I can't remember if we've had the mold problem when we left dirty dishes in the dishwasher (OK, i'm not the greatest homemaker, I have left dirty dishes in the dishwasher while we've been away!).
But this HAS happened when we've run the dishwasher and left it closed (either a full cycle or a rinse cycle).
So leave the door cracked open a bit, or leave the door open all together.