Dach and dacc is just the 115vac power supply to the door operator, it comes through the door switch on the controller, then to the power input of the door operator, the only other path, is that it feeds the controller board that lights the KDPO led in the controller. I believe that some of the door operators require a MDL type fuse, which is a slow blow fuse. if the board is new, try a slow blow fuse, if that does not work, put the door board switch to test, so that it is not trying to operate the door when power first comes on, you could have a bad door motor.