The start light flashing should be the error code.
You need to count the number of flashes from it in between the pause and let me know.
Try this and see what happens
Turn the dishwasher off.
Press and hold the start button.
Keep this held in and turn the dishwasher back on.
Wait several seconds then let go.
Now turn off and back on again and see what happens then and let me know.
Ok im going to opt out of this as for some reason the whirlpool technical site isn't letting me download any service info on this as this model has the new electronics on it and I don't seem to be able to get them up.
In the mean time I will open the question up to the other experts and if anyone else can help they will jump in.