Whirlpool Dishwasher fills and drains but won't wash

Our dishwasher will fill and drain but it won’t wash the dishes. The pump is running, but no water seems to be getting to the washer arms. We cleaned out all the interior tub parts to insure there are no blockages, and the control panel was replaced just a few months ago. Can anyone suggest a way to troubleshoot this problem? Has anyone had the same issue, and if so, how did you resolve it?