Dishwasher shuts off

When we run the dishwasher in the normal full cycle if shut off after only being on 5 or 6 minutes. Then it flashes a PF error code. It will run thru a full "prewash" cycle with no problem. I have tried replacing the control bord/panel but it makes no difference. I have been told that it may be the drain motore, but that works fine in the "prewash" cycle.

What do you think?

Remove the toe panel and check the power cord connection to the dishwasher.

Remove the inner door panel and carefully check all wires and their connections inside the door as well as under the dishwasher.

Here are the breakdown diagrams and http://www.appliancepartspros.com/parts-for-frigidaire-pld2855rfc1.html

Gene.