LA400 gate openers 24v

[Tussun]

Hi, I have just installed the la400 gate openers and can't get them to work! I have error code (7 red blinks) which is issue with photocells, have checked alignment and wiring but no joy. Decided to disconnect them in the hope that I could then test the gates worked but the only way I can get the arms moving is during the setup stage when you press all 3 buttons and then sort the travel distance, after that nothing, remotes don't work even though programmed!

1. Can gates work with out photocells? If so, do I need any jumpers.
2. If error with photocells, does it shut down the circuit board so gates won't work at all?

Any help would be great

Carl