Issa,
Welcome to the forum.

If the car seems to run on automatic, leveling properly etc., look for the DOF input to turn ON using the CRT screen if there is one. If no screen is available, you’ll have to utilize the CPU flipdip switches to access the address for this input. The manual shows how to do this. If the car lands properly and is NOT faulted, and you don’t loose DLK on your CPU, then your doors aren’t opening. Most common is for the Door Open relay circuit to fail regardless of door controller make. Whether MAC or MCE, door pilot relay contact failure is common. If the equipment uses the GAL MOVFR type door controller, again, look for the DOF input either on or off. If the car runs normally on Independant, with no door trouble, and this is a “Group” operation, check that all cars ID and LABEL match. Car 1 must be car one, and car 2 must be two both in LABEL and ID etc.

FYI- When an original first time post is made, start a new thread. It will get more views.