System Chimes and Doesn't Arm
Why does my security system quickly chime and not arm when I try to arm it?
If your security alarm is chiming quickly when you try to Arm it, individual sensors may have been installed multiple times. Each sensor can only occupy one zone at a time, so the remaining zones that are installed are "ghost" zones, and they prevent the base console from arming. The console should have the same number of zones as you have Door/Window and Motion sensors.
In order to clear up the problem, unplug the base console from the wall and remove the battery backup. This will clear out the memory in the console and allow you to re-install all sensors and remotes. As you re-install the sensors, be careful not to install them twice. We recommend not touching the TEST button on any of the sensors while the console is in INSTALL mode. Instead, install each sensor by opening the door or window that it is protecting or walking in front of the motion detectors.
If you program all the sensors in and everything works initially, but you have problems arming the system later, note which zone is reporting a problem. Reprogram the console as described above, placing a different sensor in that zone. If that same zone reports a problem later, your console may have an issue. If that zone is OK but the zone you installed the first sensor into reports a problem later, that sensor may have an issue.