My dishwasher won't run the "pre-wash" cycles but will run others

I have a Whirlpool model DUL200PKB1. When I start a wash cycle, it will fill with water and then, when full, it sounds like it tries to start but then stops and drains. It will then refill and complete all of the other wash and dry cycles. I thought it was a timing issue with the circuit board and changed it but it is still doing the same thing. It doesn't matter which cycle I choose (light, normal, heavy, etc) it never does, what I call, the pre-wash. Not a huge problem except for the water it's wasting on filling and draining. Any suggestions?