Tips for power issues that nobody talks about

I went through everything mentioned in the original post with my dishwasher. It was a Bosch model and it had completely died after a few cycles. I started by checking the circuit breaker, and that was fine. Then I tested the dedicated wall outlet with an old space heater just to be sure the power was getting to the unit, and it definitely was. No power issue there. I pulled the kickplate off the bottom to see the main wiring and the control panel, but everything looked pretty clean. There were no obviously melted wires or bulging capacitors on the circuit board itself. I followed the advice to unplug the unit completely before I started looking. The components looked okay visually, which made me nervous about having the repairman come out since a board swap seemed like the next big step.

Instead of pulling the whole board out, I decided to check the small connection point where the water intake hoses meet the pump assembly underneath. There was a corrosion issue on one of the copper terminals that was preventing a full connection. Cleaning that up and tightening the fitting resolved the issue entirely. It turns out it was a connection problem, not the electronics.

Your corrosion find lines up with somethig I hit on my old unit a couple summers back, except mine was the door latch switch rather than anything under the tub. The machine would sit there completely dead even though the board and wiring harness looked pristine, and it turned out the little plunger switch was worn enugh that it only made contact if you slammed the door just right. A cheap continuity test with a basic multimeter across the switch terminals settled it in about a minute, which is alot faster than assuming the board is toast. I'd add that switch to the checklist before paying for a diagnosis visit, since it sits right at the top of the failure list and costs almost nothing to replace.

Funny how everyone jumps past the fuse itself, because on mine that burning smell was exactly what the fuse was supposed to catch. The heating element had developed a short and the little thermal fuse sacrificed itself doing its job. Twenty bucks for a new fuse and element, both swapped in under an hour, and that was four years ago. So before anyone books a repairman over a dead machine, pull the fuse and actually test it. Cheapest part on the whole unit and it fails all the time. If the smell came back after you reset it, that's your clue something upstream burned out and the fuse is just the messenger.