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If the start button won't work, you either have a bad door latch switch and the dishwasher doesn't think the door is shut, or a bad touch control panel where the start button has failed. You'll need to take the door apart and use a multimeter to test the door switch when you push the latch onto the striker above the tub to see if the switch is still working or not. If the switch doesn't work, replace the latch assembly. If the switch is working still, replace the touch control panel.
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