Whirlpool adg 644 ix led is constantly flashing. There a pause after 16 flashes and then it starts again. I have tried to reset but dishwasher goes into drain mode and then stops after 60 seconds. The fault codes do not list constant or 16 flashes, so don’t what the fault could be. I have checked the NTC sensor, the power switch, door switch, the two pumps and they seem to be working correctly. Any ideas?