We just finished a renovation and can't get this new dishwasher to work properly. During the wash cycle the water is draining out slowly. Because we have a few cabinets in the way, including a corner cabinet, the plumber hooked up the drain directly to the waste line by going through the floor. He added a high loop of about 18" before it drops through the floor so I can't believe it's just gravity pulling the water through.

Anyone ever have a problem like this? What do I do to fix it? I haven't contacted whirlpool yet in case it's something simple.