Some ADE Accentra do have a service timer fitted in the software but not many and it does cause a regular beep, I'm afraid changing the program in engineer mode will only sort this, you need an alarm engineer to attend
But just in case check smoke alarms even ones you forgot abaout and they might be in a cupboard, rape alarms in ladies handbags covered with the usual ladies items, carbon monoxide detectors, if you are convinced it is the alarm then a local engineer is needed,
B
April 2009