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alarm bell is ringing when the system is not active?

the alarm is ringing when the system is not on
MR GERALD GRAY, December 2012
The panels backup battery needs replacing.

e manno, December 2012
Possible power/battery fail, check power to unit, is mains light on. No, check fuses, then check battery, No power, it would run on battery until battery was flat, then alarm would sound

SD, December 2012