Warning: A bad door zone sensor on a 2005 Kone MonoSpace took me three days to figure out
Got called for a car that wouldn't level right at a medical building. The door would open about two inches and then just stop. I checked the motor, the belts, the controller logs, everything I could think of. The problem was a tiny, almost invisible crack in the plastic housing of the door zone sensor, letting in moisture and giving a false signal. I spent two full days on the wrong stuff before I found it. Has anyone else had a sensor fail in a way that didn't show up in the standard diagnostics?