I have an Otis triplex 17 openings with 23 ucl controllers. The problem that I am having is a zonning problem. The middle car works perfectly. When it is bumped out of the bottom zone it goes to the middle of the hoistway and parks. However when one of the other 2 cars when bumped out of the bottom zone. It will go the the middle of the hoistway and zone. But it will run from the 9th floor to 7th floor and will not park.When one of the other 2 cars leave the bottom zone the car than runs between the 9th and 7th floor will return to the lowest floor and park. The other car when bumped out of the bottom zone travels all the way to the top landing and stops and returns to the bottom zone and parks. It does not try to stop at all in the middle of the hoistway like the other 2 cars. When these cars are working properly. There is always 2 cars in the the lobby which is the lowest landing. This equipment was installed in 1969. Any suggestions would be greatly appreciated.
Regards
