Hi, I've got what I believe to be a reliable elevator that has a sensor edge on it that stops the doors but it won't reopen them. The door open button also does not work. This is a new unit for us and there are no prints on site. I think it may be some sort of re open relay problem but i don't have a nomenclature page to reference to see what relays are what. Does anyone have any ideas or know where i could find some prints?