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need to disconnect mains?

I want to work on the electrics in my property and cannot as every time I turn off the power the alarm sounds, how do I stop this from happening? The system is an Accenta / Optima G3. Please help
Micky boy, March 2008
If it's going 'beep' or similar intermittently, enter your code, it's just telling you that the mains supply has been turnrd off.

Or, as I suspect the outside sounder is going off it's the standby battery in the control panel. You need a new one.

acorn, March 2008
Enter your code to silence it.

Dave, March 2008
link Click here to see other fixes for Optima.