How to Stop the ADT Alarm from Beeping (Low Battery)

By Trae Jacobs,

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While ADT Alarm systems help keep your home safe and have many benefits, they can be difficult to navigate and troubleshoot for new users.

A constant beeping from your ADT Alarm system usually means the battery is running low. You can silence it by pressing the “OFF” or “#” button on your keypad, depending on which alarm system you have.

How to Stop the ADT Alarm’s Beeping

If your ADT Alarm is running low on batteries, pressing either the “OFF” or “#” button on your keypad will silence the beep coming from the alarm panel.

While most ADT keypads can be silenced with the “OFF” or “#” keys, not all of them can. There are many different ADT keypads, so if neither button works, find your specific model or contact ADT customer support for help.

Until you replace the batteries, this is just a temporary solution. A low or dead battery will prevent your security system from operating correctly, so even though it’s annoying, this beeping is a good thing.

Pressing this button just mutes the alarm. To fix it for good, you need to find out why your battery is low to begin with.

How to Fix a Low ADT Alarm Battery

Depending on which ADT Alarm system you have, you might need to:

Recharge your battery
Replace your battery

Usually, recharging or replacing the battery will stop the beeping for good.

Recharge Your ADT Alarm Battery

ADT Alarm batteries most often die out due to outside factors like a power outage. When there’s a power outage, you’ll usually see a “No AC” message. This means there is no AC power going to the system.

All ADT Alarm systems are equipped with a rechargeable backup battery for this exact scenario. When AC power is unavailable, your system will alert you that the backup battery is in use.

The backup battery typically lasts 24 hours in a power outage and automatically starts recharging when AC power is available. It usually takes about 48 hours for it to recharge completely.

If the beeping doesn’t go away after 48 hours, look into getting the battery replaced.

Replace Your ADT Alarm Battery

If you haven’t lost power recently, or if the beeping doesn’t go away 48 hours after power is restored, you probably need to replace your ADT Alarm battery.

ADT Alarm batteries are relatively inexpensive, but it’s best to have your battery replaced directly from ADT.

Most ADT Alarm panels use a 12 volt battery, but a few models use a different-sized battery and you want to be sure you get the correct one. Visit your ADT account page and select “Replace Battery” to find out which size you need.

How you can replace the battery depends on whether you’re a MyADT or ADT+ user. Here’s how MyADT users can replace their batteries:

Log into your MyADT account online.
Select “Alarm System.”
Select “System Test.”
Choose your test duration, then press “Start Test Mode.”
Remove the cover from your alarm.
Disconnect any battery wires, then remove the old battery pack.
Insert the new battery pack and reconnect the wires.
Put the cover back on.
Return to your MyADT account page and take your alarm out of Test Mode or wait for the timer to run out.

And here’s how you can replace the battery if you’re an ADT+ user:

Open the ADT+ app.
Tap the two lines in the top-left corner.
Select “Monitoring,” then “Monitoring Test Mode.”
Choose how long you want to disable monitoring.
Remove the cover from your alarm.
Disconnect any battery wires, then remove the old battery pack.
Insert the new battery pack and reconnect the wires.
Put the cover back on.
Return to the same page on the ADT+ app and tap “Enable Monitoring” or wait for the timer to run out.

Sometimes, the system needs to be reset after a battery replacement. You usually just need to enter your security code and press “OFF” twice to do this.

Why is My ADT Alarm Battery Draining So Fast?

When you notice that your alarm system battery is draining faster than normal, it could raise concerns about whether your system is working properly.

This is due to a faulty or worn-out battery. If your battery is draining faster than it should, it’s time to replace it.

Other Reasons an ADT Alarm Could Be Beeping

Understanding how everything works with your ADT Alarm system can be daunting. While we’re specifically discussing beeping related to low batteries, there are a few other reasons your alarm could be beeping.

Your system is unmonitored. If you don’t have an active ADT plan, your keypad may beep to alert you that it couldn’t reach ADT. Contact ADT to disable the system or sign up for monitoring.
The cover is off. If your keypad’s cover has come off, your alarm might think someone tampered with it. Put the cover back on, and the beeping should stop.
Connection troubles. If your alarm is having trouble connecting, it’ll likely show a message on the display. This should stop after you enter the security code.

What Does a Flashing Triangle on My ADT Alarm Mean?

Having an ADT Alarm system means all kinds of sensors and signals you need to figure out. One of these is a flashing triangle in three colors — red, orange, and yellow.

Red Flashing Triangle

The red triangle is an indication that your battery is low. You will need to either recharge or replace your battery.

If you replace the battery, you might need to reset the system before the triangle will go away.

Orange Flashing Triangle

An orange flashing triangle on your ADT Alarm is the most serious of them all. When you see an orange flashing triangle, it’s ADT telling you there is an intruder in your home.

Yellow Flashing Triangle

A yellow flashing triangle is a little more complicated. This indicates a “trouble condition” with your alarm. To find out what it means, press *2 on your keypad.

A yellow flashing triangle could mean: