intermittent beeping from control panel?

i have an accenta+ (ADE) control panel linked to a accenta 8 mini alarm box. every 5 mins or so i get a single beep lasting approx. 1 second..i believe its a maintenance reset code that i require, apparently if the system is set/unset a set number of times, this beep will sound until a code is entered to stop it...any ideas? if so, can anyone provide the code please, cos its drivin me mad!!! many thanks, norman