How do I troubleshoot a dishwasher that runs normally until wash cycle begins, then doesn't wash?
My dishwasher was stopping similarly and it turned out that there wasn't enough water pressure. Simply opening the water valve feeding the dishwasher resolved the problem.

It doesn't sound like this is your problem, but it's a very simple thing to check that the valve is fully open, and it might help someone reading this page in the future.