Whirlpool Dishwasher Quiet Partner 3

The "Normal" light on the front panel of my Whirlpool Quiet Partner 3 dishwasher flashes quickly and will not turn off. I have tried to reset the dishwasher, but the problem persists. I replaced the controller unit, which is located on the right side of the front panel, and the light still flashes. I have not replaced the keypad unit. Any help would be appreciated. Thank you.