Having checked the list of Accenta models the 8 is the "pig" of the litter.
Reset is as follows:-
disconnect power,battery & mains.
Remove all wires from terminals 17 (PA) and 27 (set+)
fit a link wire between these two terminals and connect power.
system will power up with no alarm
remove link and refit wiring.
Keypad will show any open zones.
when all zones clear and lid tamper clear panel will beep and go into day
mode clearing NVR.
User code 1 is now 0123 @ eng code is 9999

CJ