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optima xm?alarm going off when mains is isolated?

alarm goes off when i torn mains power off. it did not use to what is problem and also can i add exta door sensors to the one already installed
garry, April 2009
Your alarm probably needs a new internal battery - you can add more door sensors if you like, but its best to consult the fitting diagram if you have one.

John, April 2009
link Click here to see other fixes for Optima XM.