I agree with dragon, the u shaped stand offs look like they could be a hall effect type magnetic switch. Depending on which combination of the three was on versus off would provide for 8 different inputs that is interpreted by the processor as to desired mode selection.
Does a part of the rotating assembly slide inside the "u" that would trigger the switch?
And is it possible something is reassembled out of phase?
Like 180 or 120 degrees off.?
Again, I never disassembled one so I don't know if all components are indexed. Just a wild and guess.??????
Yes, it's slides inside that U but it's got stops so can't really get it out of phase. I'm about 99% sure it's in the correct order.
It's hard to describe how it works (because of my lack of background in this area) but its' not too crazy complicated when you see how it works.
(I'll attempt to explain, here goes)
The black sleeve fits around the outside of the white cylindrical shaped dial.
The black twin tower sensor has that U shaped divide in the middle which is where the dial fits into. The dial also clips into the circuit board planting it.
The dial is stationary covering the inner tower sensor while the sleeve slides around the outside of the dial as you turn the knob and it somehow passes inside of the outer tower sensor which I assume communicates to get hot or cold, speed up or down, or select the different modes.
There are also stops in the box that only allow the sleeve to go so far in each direction and the sleeves are specific to each dial. For example the Mode sleeve will not work properly with the Temperature sleeve. So if you put the wrong sleeve with the wrong dials it won't work properly..... don't ask me how I figure that part out....
But I've got them on correctly.