Sounds like your internal battery in the alarm panel is
flat/goosed/knackered. Simple to replace. Basically if the bell box
doesn't have 12volts going to it, it will start to ring. And nothing will
stop it unless its own battery is disabled or disconnected or power is
restored.

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Regards

SantaUK
Mail me at:
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"Chris Wilson" wrote in message
...
As of the last few days our house alarm outside bell (siren really) box
sounds if the mains goes down. It never used to, the only reason I first
noticed was an RCD tripping fault on a mains ring circuit tripped the
fuse box RCD, and the alarm sounded, although the control panel was in
"Daytime" mode, and no panel lights showed. Restoring mains stops the
alarm, but resetting the alarm panel has no effect. Any clues what's up
with the damned thing? Otherwise the system appears to function normally.
We get not infrequent power outages here, so this could be a damned
nuisance ;-) Thanks.

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Best Regards,
Chris.