Pressing 'Start' button result in blinking LED and unit doesn't works

Whirlpool Dishwasher GU2400XTPS6:

Recently I disassembled and reassembled the dishwasher. Since then it’s not working. When I press ‘Normal’ only ‘Heated Dry’ led will be lit and when I press ‘Start’ the led will just blink and nothing happens. The unit was working perfectly before dis-assembly. Any help is greatly appreciated