I have a Kenmore Elite Ultra Wash Dishwasher with an error code of F2E2 which came up suddenly flashing after I opened the door to put dirty dish in it. I have cleaned the filter. The only thing I did since I last emptied it was to put in some Jet Dry. Help.

Look at these: https://dl.dropboxusercontent.com/u/8010163/Whirlpool_Kenmore%20Dishwashers.zip
It sounds like you have a stuck float switch. Look in the bottom of the unit. Something has it stuck, like food.