I had the same issue with mine before the control board went, the middle spindle on the bottom where the water jet shoots up to the top spray heads wasn't pulling up and therefore not directing the water in a powerful stream upwards. If you reach into the middle of the dishwasher there will be a small cone that expands to about 10 inches long when the water pressure pushes it out, pull upwards on it to see if this is pulling upward toward the top 2 spray heads. Mine was not poping up and had logded itself due to calcium buildup. Easy fix hope this was the problem.