I started experiencing the dreaded blinking Clean LED (7 times) a few days ago on my 5-year-old Whirlpool DU1145XTPQ1
dishwasher. I popped the cover and took a digital multimeter to the top of the control board. I checked the continuity of the heater element (P6 and white-violet wire on the door switch) and it read 13 ohms. I then checked the continuity of the thermistor (P2-2 and P7) and it read 64K ohms (it was about 65F in the house).
It looked like both of these were fine so I assumed that it was the control board itself. I removed all of the cables and separated it from the plastic housing and made an interesting discovery. There was a nice burn mark (understatement) on the bottom of the board near the corner of relay K2 (see pic).
I'm ordering a new board from this website now. My question is, does anyone know what would cause this relay to burn out? Was this a freak occurrence or do I have a short somewhere that will blow the new control board when I install it?