Yeah,the old Otis A-B based system.
It's boolean,but Otis called it goolean.
I installed a few of those on some really old otis .
Does it have the floating tape in the hoistway with a reader on top of the car?
If so,it maybe lint or some other foreign object on the tape or it could be a bad opto coupler chip for that floor.
At least I think thats what the selector you have now is.
