the battery is faulty,if you open the panel,you will need engineering code to reset ,the default is 07890,if the alarm company who fitted the system has changed it,you will need to do a full reset,that will put it back to factory defaults,to do this,turn mains off,open cover,remove red lead from battery,locate two little pins on the printed circuit board,place a small screw driver between them,put red lead back on battery,remove screw driver,close panel,apply mains,the user code will now be 1234,the eng code will be 07890,you now have done a full reset,you can change the user code to what it was now.i take it that you have the user manual
gts, September 2010