What do the LEDs on the Alarm.com module mean?

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Depending on the panel, the Alarm.com module has a set of LEDs near the corner of the module that indicates different statuses.

Panels with LED light indicators on the cellular module:

DSC Impassa
Interlogix Concord
Interlogix NX
Interlogix Simon XT/XTi/XTi-5
SEM - DSC PowerSeries
SEM - Honeywell/ADEMCO Vista

The following table explains general information about what each LED light indicates. For more information about each LED light and its functions/patterns, see the specific panel's module installation guide in Panels.

LED	Function
L1	This light indicates general and cellular errors. If L1 flashing, then there is an error with the Alarm.com Module. The light flashes 1 to 8 times in an 8-second interval to indicate specific errors. For more information about what the number of flashes indicates as an error and common solutions, see Panels for the specific panel and module type. Note: It may take up to 10 minutes before L1 detects and flashes an error code.
L2	This light indicates communication between the panel and the module. L2 flashes every time a data packet is received from the panel. Additionally: For HSPA/CDMA modules, this LED also indicates Z-Wave status messages. For Dual-Path LTE modules, this LED also indicates broadband errors. For more information about what the number of flashes indicates as an error and common solutions, see Panels for the specific panel and module type.
L3	This light indicates communication with Alarm.com. L3 flashes every time the cellular signal level is checked and when packets are exchanged with Alarm.com.
L4	This light indicates the signal strength. L4 flashes 0 to 5 times to indicate the module signal strength, or toggles on/off slowly when actively communicating with Alarm.com servers.
L5	This light indicates Z-Wave status and errors. If there are no Z-Wave devices learned into the module, L5 will blink. Note: L5 is not available on every module type.