Flashing light 6 times, whirlpool dishwasher ADP4501
I had the same problem with a Whirlpool ADP 6515, led flashes 6 times, pause and repeat.
Open the door, remove the 2 screws that hold the control panel (1 top left, 1 top right). Gently lift the control panel up and away from the door to reveal the wiring, controllers etc. My controller was a Flextronics UCB-IC-EBL-P7-M3-HE1. Look at the connectors, one of them is marked on the controller as NTC and has 2 blue wires, push down on the white plastic tab below it and disconnect it (pull it horizontally away from the controller)..
I used a multimeter on 200k range and measured the resistance by probing those 2 blue wires and the NTC temperature sensor measured about 50k ohms +/- 5k depending on the room temperature. And that is correct for that NTC. (I knew the NTC was good as I had removed it from underneath the machine previously and measured the resistance whilst holding it under the hot tap as it went from cold water to hot. It's a Negative Temperature Coefficient sensor so the resistance reduces as it gets hotter).
So problem was definitely not that.
Solution was simple, on the connector itself, just use a very small flat bladed watchmakers type screwdriver to clean the pin contact faces and then gently pinch the pins of each wire closer together so that they bites tighter onto the controller.when you reconnect it.
Refit the control panel and problem solved.
Conclusion; the contact resistance of the connector to the controller added to the total resistance of the NTC and made the dishwasher think that the water was below the safe activation of the motor cycle, e.g. it thought the water was iced up.
Job done !
on Apr 17, 2019