pressure sensor or, in case of smoke, censer, see.......
...Why does my dishwasher smell like High Mass at Smokey Mary's?
I wonder if that was what was wrong with the Consumer Reports machine (and with the few I saw)? I remember how Consumers' Research, I think, rated the GE combo unacceptable because of very poor water extraction (imagine how bad it had to be to flunk out on that), then found out that the OOB switch mechanism was not working properly and when that was corrected, it was still no star, but no worse than the rest of the early 60s combos at water extraction. Properly calibrated, this could have been the best 30" wide dishwasher to wash no more than 6 glasses.