Ford F-450 crane does not turn on

Well, I am repairing a Ford F-450 crane type 2005 it has a mechanical arm which can be manipulated from the basket or a control that is in the bodybuilder the problem is that the car no longer turns on this after being manipulating the mechanical arm the vehicle has a signal of ignition and gives the star but does not turn on me that the control that is in the basket Articulated arm and the ignition signal? ... When I give the Star on the board, a 62420 code appears