Alarm - AT&T Merlin Legend MLX-20L Operation Manual

Alarm

If something is wrong with the system, the red light next to
your Alarm button goes on.
Report the alarm to your system manager or an AT&T
representative or authorized dealer immediately. The red light
stays on until the problem is cleared from your system.
If you inspect the Alarm button when there is a problem, the
system shows you the number of alarms that are active.
4-8