Dishwasher

Is it not draining or is it overfilling? Overfilling is caused by a float in that little upside down looking cup at the front of the tub. Just remove cover (cup) some are held down by a screw in the back and some just pop off. It's probably just sticking, but you may need a new one if the slide is rusted or the switch burnt out. If it's not draining, then check for anything that fell into the bottom and is covering up the drain grate, and if that's ok, then pull the unit and pull the drain hose off of water pump and under your sink and hit it outside with full pressure water from a water hose, cleaning it out. IF it still has a problem, then you need to replace or rebuild the water pump.