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One door quit being armed?

Hello,
I noticed that one of my doors doesn't work now when you come in thru. It's like it's not connected anymore. Why would that happen?
Robyn, September 2011
Or more likely a 'stuck' reed switch.

Give the contact a couple of gentle taps (the bit in the door frame, not the door) - then try the alarm again, bet it works.

If it does replace the contact as it WILL happen again.

acorn, September 2011
Broken door contact or cut wire

NSIN alarms, September 2011