scantronic 9448 alarm with 9427 control panel?

i would take an educated guess e manno,that the panel has reverted back to factory defaults,(battery) ?
and the person has changed the default code to hers/his/but the panel needs reprogrammed ,just a guess :-)

gts
April 2013

And which code?,

Have you been playing around in programming by any chance?,

You need to tell us more other than you changed the code and now it won't set.

Also 9427 is the keypad model and not the panel as you have posted above.
Things like:

As said we need more.

e manno
April 2013

why did you change the code ???/

gts
April 2013