Hello, I’m Nathan, and I’ll be assisting you today. My livelihood depends on your positive feedback, so your satisfaction is my highest priority.
Sorry to hear you’re having trouble.
This issue is coming from either a failing backup battery or a connectivity issue. To get rid of the message the system would need to be put fully back into service.
If you are not using the system, it should be taken out of service, meaning to disable it completely. It can always be restored later, if desired.
Locate the main panel, which will be a metal enclosure about 1'x2'. Open that up and inside you'll see a small cube shaped battery. Disconnect the 2 wires from it.
Then locate the power supply, which is just a big all transformer/plug, that will be plugged into a nearby outlet. You may need a screwdriver to release it. With the battery and power supply disconnected, the system will fully shut down and stop beeping.