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Thanks so much for your advice. Sorry for the delay in posting a reply. Yes it was just the batteries! The batteries in all 3 sensors were flat! Had CR2 batteries in them. As soon as I put a new battery in, the alarm sounded. :D

Hi, First time caller, long term listener. I have 2 wireless door contacts (one on the front door, one on the back). The alarm lets me arm it and does all the normal irritating sounds likes it's fine but doesn't notice when I open either door any more. Now, i'm not too fussy but having a...