The one that stands alone. If it is dead, and you hear nothing in the pump out cycle, it will most likely be the pump. If the pump comes on, and it does not drain, you could have a clogged drain line. Pull the drain hose off, at the dishwasher, and where ever it goes under the sink, and take it out side, and put the water hose to it, and be sure it is clear. The other question is, did anybody put a new garbage disposal in? If so, they might not have knocked out the drain plug. Tom