AUX fuse has blown. You need a 20mm quick blow fuse, available from Maplin ect.
WARNING mains is present inside the panel, if unsure get someone qualified.
It will go off when opened, enter code and replace fuse blown, a test meter will be needed as a visual inspection is never conclusive. Otherwise its the fuse by the terminal marked 27, the 1st of 3 fuses.
Close lid enter code job done.
As above if unsure call in someone.
Alarm, July 2011