Why Is My Honeywell L5100 Showing a Blank Screen?

Your Honeywell L5100 is showing a blank screen because it is not powered on. You must restore power to the system to get the screen to come back on. This can be done by plugging the power transformer back in or reconnecting the system's backup battery. The screen will return after boot up.

Honeywell lynxtouch l5100 lynx touch wireless alarm control panel

Every alarm system requires power for normal operation. This primarily comes in the form of AC power from a plug-in transformer. But if the electricity goes out, then a system can also remain powered using a backup battery. If the system loses both AC power and battery power, then it will shut down. This can be easily identified by having a blank display screen.

Once power is restored to an L5100 System, then it will power back on automatically. The system will perform a boot up process that will take a few minutes. Once the boot up process is complete, the screen will be restored for normal system operation. The system will remain that way as long as it is powered. If you want the screen to display something else, then using the slideshow feature is a great option.

Remember, the L5100 will only have a blank screen if it has been powered down completely. This can be an important thing to check for if you are making hardware changes, such as installing an IP communicator or a Z-Wave module. Make sure that the screen is completely blank before attempting to install this equipment. Making hardware changes before the panel powers down completely can result in damage to the system.

Keep in mind that the system cannot send outbound communication signals to AlarmNet or a central monitoring station when it is powered off. The system must be powered on to provide active monitoring service. This is very important to remember if you ever decide to leave your L5100 System powered off for an extended period of time.

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That is normal operation for the L5100, if you have enabled the backlight timeout. Some customers do not have backlight timeout enabled.
Mine has always had the display go blank after about 30 seconds of inactivity. The green and red LEDs always illuminate to show whether the system is armed, disarmed (and green will blink if sensors are activated). Isn't a blank screen part of the programming options?

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