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Accenta G3. Home alarm system?

The entry/exit door sensors work sometimes and not others. When they stop working, I lightly rub one of them and they work again. They are not dusty or dirty.
Any ideas how to correct the prolem please?
David, December 2008
Thank you very much Joe. Out of interest, what makes them wear out please?

David, December 2008
Hi David, the door senors will need to be replaced, if not it will go down hill, only cost one to five pounds depending on units used.

joe, alarm installer, skegness, 07525922917, December 2008
link Click here to see other fixes for Accenta G3.