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Good afternoon. My name is ***** ***** I'm here to help you with your dishwasher. It sounds like you're on the right track but there are a few possibilities. If you're certain that there is power getting to the dishwasher, remove the kick panel below the dishwasher and look for the 3" x 3" sheet metal box with the wire connections in it. Turn the circuit breaker off to the dishwasher or unplug the dishwasher before servicing. Remove the cover plate and look at the wire connections to see if any of the wires in the junctions box have shorted out. If they have been shorted or melted, you'll need to cut them back and re-wire them. If you find nothing at all wrong with the connections, then your fuse or control board is just shorted for one reason or another and the fuse or control board inside the door will need to be ordered and replaced. You can't test the control board but you can test the fuse. The fuse is mounted to the control board inside the control panel. Once the fuse is removed, just check continuity if you have a multimeter to determine if the fuse is bad or not. If the fuse doesn't have continuity then replace it. If you don't have a multimeter, then just order and replace the fuse as it will be cheaper than buying a multimeter and it will give you the same answer.
Below is a link to the fuse if you need to order it since that's the most likely culprit.
CLICK HERE for fuse
Now as for why the fuse fails, it fails because the wires used a metal that didn't conduct very well so the connections would heat up between the wires and fuse. That is why the new fuse comes with new wires which you must cut and splice in. Do NOT replace the fuse without the new wires or the fuse will just go bad again.
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Hello again. I'm just following up because I haven't heard back from you and I see this question is still open. Is there anything else I can help you with?