Hi! I am not an elevator technician, but I am the owner of a building with a Concord Horizon Series 8000 LULA. the lift was installed in 1999; I bought the building in 2011. I can't find any manauls or circuit diagrams.

My problem is that the doors won't automatically open when the lift is called. The lift will run upa nd down but the automatic door does not open. The tech that the local repair company sent couldn't find the problem without prints.

Can anyone please help? Either with circuit diagrams or places to look for the problem? I greatly appreciate it.