In order to check troubles on the DSC Alexor, you will need to enter *2 on the keypad. At that point a totally different number should show up. Once you get this number, please document it and refer to the trouble conditions which you can find here:
Light 1 - Service Required - Press the 1 key for more info. If the number 1 light stays on, it means the Main panel battery needs to be swapped out. Light 2 will mean there is an open Bell Circuit, Light 3 means General System Trouble (usually associated with Cellular/Internet Communicators), Light 4 means General System Tamper (Open Tamper on an Expansion Board), Light 5 means Module Supervision (panel can't see enrolled keypad), Light 6 Means that a Wireless Jam has been detected, Light 7 means Expansion Board low battery, Light 8 means Expansion board A/C Failure.
Light 2 - Panel A/C (Power) Failure
Light 3 - Telephone Line trouble
Light 4 - Failure to communicate
Light 5 - Zone Fault - Press 5 and then another light should light up. This represents what zone number is in fault.
Light 6 - Zone Tamper - press 6 and whatever light appears is the zone that has the tamper.
Light 7 - Wireless Device Low Battery - Press 7 once to view Wireless Zones, Press 7 again to view Handheld Keypads, and press 7 again to view Wireless Keys. Once you figure out what zone its coming from, all you should have to do is replace the battery.
Note: The DSC Alexor is a discontinued product and is no longer manufactured by DSC)