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When I bought my house there were two home security devices installed, one was Ademco and the other, Honeywell (see pics below). I didn't pay attention to them and didn't ask the former owner questions (now he is no longer available).

Recently both devices start beeping unexpectedly, two times from Honeywell devices last night when everyone sleeps, for example. It becomes annoying. I can stop the beeping by pressing the "chime" button on Honeywell's keypad but it's not a permanent disabling. It would start again.

From the LED panel I did notice that it might be low battery issue.

Now my questions are:

How can I factory-reset the devices w/o knowing the passwords?

How can I change the battery for these devices?

Thanks

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Do not factory reset the alarm system!

The system will be programmed to recognize all it sensors (doors, window, smoke and heat detectors, etc) and to correctly identify them on the control panels. For example if a kitchen window is open, the panel will say "kitchen window open" instead of just "zone 23 open". It will also be programmed to recognize "entry doors" so when you walk into the house through an entry door, you get some time to turn the system off, but not if you break in through a basement window. If you subscribe to a monitoring service, it will report fire, intrusion, etc according to the device type. If you factory reset the system you will need to reprogram everything. While it's possible to do that from the keypads, it will take you weeks to learn and do. The alarm installer will have done it from a laptop using proprietary software. You should not undo all that work!

Just learn to do what you need or get your new monitoring service to do it

You need to find the manual for your system. There is an "installer code" you can enter while the system is disarmed. It is almost certainly the factory default installer code, or if it's an ADT system, the default one that ADT uses. That will allow you to remove all user codes and to program a new "master" code. You need the installer manual to figure this out. Once you have a new master code you can then do everything you need from the homeowner's User Manual, which you should also get. And if you want monitoring, your new monitoring service will want to test and verify everything so they can probably do all this programming for you in seconds when they visit.

The battery will be somewhere in the house in a metal box, probably one with a key lock (probably not locked) and with lots of wires coming out of it. It looks like a tiny car battery. Look at the model number, you can buy them on Amazon. Meanwhile since the alarm is useless to you now, if you find that metal box you can unplug it from AC power. The battery will die completely within about 12 hours. The alarm system will beep and annoy you while that happens, but then it will leave you alone until you are ready to deal with it.

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  • i found the box hosting the battery and unhooked it, for now. The beeping stops. I'll follow up on the setting instructions a while later. Thank you very much for your advice!
    – J.E.Y
    Apr 28 at 13:18
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Normally (if a wired alarm) the battery is in the alarm system box (typically a 12V gel-cell or AGM lead-acid battery.) If wireless, every [expletive] thing will have a battery to replace.

For reset instructions look up the model of the main alarm panel (not the keypad) for instructions. Start with the lazy option of "try the factory default" since many people don't bother to change them.

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  • Thank you a bunch!
    – J.E.Y
    Apr 28 at 13:19
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It may be one security system with two panels. Usually the main board installed near electrical panel. It is powered from main power and battery for backup. Battery may be inside the box with main board. In order to reset password you need find out the type of security system board and find manual over internet. It should has info about reset procedure and default password. But if you not have plans to use it just disconnect the battery and main supply. It is may be transformer aside of electrical panel. And number on Ademco panel it is zone there the sensor activated, list of zones usually on backside of panels cover.

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  • Thank you very much!
    – J.E.Y
    Apr 28 at 13:19

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