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Concept 6 fault?

My alarm. when set to day (so not primed as such) often goes off with a tamper sign showing...........this is normally around 2am in the morning..........putting in my code and resetting gets it back to normal.....but there is obviously a fault of some kind..any ideas ?
Phil W, February 2008
Best left for an engineer to sort out

DD, February 2008
link Click here to see other fixes for 6.