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Accenta house alarm?

I have a accenta optima g3 house alarm, the alarm keeps going off in one zone for no apparent reason,can any one advise me please.
The paddle, August 2007
if its a pir detector (passive infra-red ) eg zone 1
or a door contact for entry and exit ...... just replece them for new devices

leo, August 2007
link Click here to see other fixes for Accenta G3.