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securitech 800L?

My alarm panel still lights up, and makes the correct tone when I put the number in. The alarm will still activate BUT it is when I open the door to the house. It should make a two tone noise, as an alert the door has been opened. This has stopped. No noise at all. Any idea's?
mark, November 2011
guys,you know what sd stands for?
stupid dope,as his answers clearly show :-)

gts, November 2011
I believe this has been said before, SD you have not got a clue, so kindly stop giving out incorrect advice.

Alarm, November 2011
Oh dear, 'I would think' doesn't help.

The door contact has 'stuck' closed therefore it does not operate when the door is opened, nothing to do with a programming change.

Replace it.

acorn, November 2011
As you had a problem, I would think that settings have changed, check your user manual, probably need to be told that the door is an entry way

SD, November 2011
link Click here to see other fixes for 800L.