hi guys, my alarm wasn't working, think a bulb had made the alarm trip out, so i took the box off, and the alarm went crazy wouldn't go off, so i turned the mains off and disconnected the battery leads. To fix it, turn power off at the wall, and reconnect the battery, the alarm will go off, enter 0123, this is the master code, turn mains back on. to put your old code in or a new one hit prog then 0123, then 8 or 7 (depending on how old the alarm is) then your new 4 digit code then reset.
Hope this helps, as I had to suffer about half an hour of an alarm going off neighbours weren't happy
raymondo lochetti, August 2010