I have the same dishwasher. I have found that this dishwasher had a control panel problem. After the dishwasher finishes washing you will noticed that the small green lights stay illuminated. Over time this causes the wire ribbon that connects the control panel to the circuit board to become burnt. I have already replaced my control panel once and now it has done it again. i am about to have to order another control panel. That is going to be another $140 dollars out of pocket. The part number for the control panel is( AP4365240). If you have the same dishwasher as I do it should be correct, Open the front door and look on the inside left and you will see the model of the dishwasher. Mine is MDC4650AWB1 Yours may be slightly different. look on the front of the control panel to see if it reads from left to right. High temp wash or extra rinse, sanitize, heated dry, start/cancel, delay, and cycle select. Since the dishwasher is designed poorly and the lights do not go off after drying, if you can after the dishwasher finishes with it's washing and drying be sure to open the door for about 2 min and the lights will go out by themselves. Then you can close it back. This will allow your dishwashr to last longer without the wires burning out. To verify that it is the control panel after you carefully remove it take a look at the wire ribbon that runs from the control panel to the circuit board. Here is a quick class on how to remove the control panel. open the door and on both sides you will find 4 star tip screws. remove them and seperate the door from the backing. After that you will need a socket to remove some hex tip screws that holds the control panel to the door. be sure to remove the black box that contains the circuit board. take the cover off and carefully disconnect the wires. the wire ribbon that connects the control panel is a little tricky. You have to seperate the plastic connector block and the ribbon will slide right out. after you remove it go to http://www.appliancepartspros.com/Appliance-Parts/whirlpool-panel--con-item-number-ap4365240.aspx
and you will be able to order the part online to replace it. Be careful not to drop any of the screws and also pay attention to the door latch when you move it to the side while you work so that you do not break it.