What monitoring devices have you running on zone six ?,there's a possibility of smoke, or carbon monoxide detectors running,
If you can bypass/omit zone six then it isn't a fire zone,
your fault here is with one or more detectors on that zone,if zone six isn't used it should be linked out with a diode.
I would also default all communications, as the panel will have been programmed for this on installation, due to the requirements of the monitoring contract, or program it with your cell no`s if you wish.
There doesn't sound like you have either AC/mains,or backup battery issues here,but that cannot be ruled out without further tests.
The switching of the panel you discribe is just the triggering effect on it caused by activation,
you can run this panel on either AC only, or battery only,or both as recommended.As for a fried board, it highly unlikely, but cannot be ruled out.Unfortunately a replacement isn't an option, as this is now obsolete,and ADT uk and usa have now moved on from the XL2.
As for the programming, its in the manual,but there maybe some programming changes made by adt that are not in there.A google search can turn up the XL2 hook up manual.
e manno
May 2012