There was a thread on here from several years ago on this topic. I have a Honeywell LYNXR-2 security system from ADT I no longer have their service, but the alarm goes off periodically. I can get it t shut off for a few days entering the use's code, but it doesn't stop it permanently. I don't have the expertise to pull the electricity to it, and I can't get the system open to pull the battery. Is there a code or series of codes that I can use to deactivate it?

You don't need a code.

how to disconnect adt security system - Bing video (http://www.bing.com/videos/search?q=how+to+disconnect+adt+security+system&qpvt=how+to+disconnect+adt+security+system&FORM=VDRE#view=detail&mid=1224B13D73086E4EA8201224B13D73086E4EA820)

how to disconnect adt security system - Bing video (http://www.bing.com/videos/search?q=how+to+disconnect+adt+security+system&qpvt=how+to+disconnect+adt+security+system&FORM=VDRE#view=detail&mid=96589996B5A78B77997696589996B5A78B779976)

how to disconnect adt security system - Bing video (http://www.bing.com/videos/search?q=how+to+disconnect+adt+security+system&qpvt=how+to+disconnect+adt+security+system&FORM=VDRE#view=detail&mid=A4E89F33149231E75F9DA4E89F33149231E75F9D)

how to disconnect adt security system - Bing video (http://www.bing.com/videos/search?q=how+to+disconnect+adt+security+system&qpvt=how+to+disconnect+adt+security+system&FORM=VDRE#view=detail&mid=D541A2D7115A809B9B07D541A2D7115A809B9B07)

And

How to Disable the Alarm System in Your Home (http://www.home-security-systems-answers.com/disable-the-alarm.html)

NOTE - The links have the same title and basic content, but they are different videos.