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A non- related battery powered smoke alarm?

Suspect it is your smoke alarm

Alarms that activate like this during a power cut are most likely unmaintained and will require servicing by an engineer. We do not provide engineering manuals, defaulting procedures, codes or disabling information here. I can only suggest that you try all the user codes you can think of and if the alarm will not silence you will have to contact someone to repair it. It's recommended you service your system regularly, (even if you don't arm it often) so this type of thing doesn't happen.