How do I reactivate my ADT system?

Author: Barbara Homenick Jr.  |  Last update: Tuesday, November 25, 2025

ADT. If you have an ADT system to reactivate, you'll need to call +1-800-587-4198. You'll probably need to sign up for an ADT contract if you don't already have one.

How do I get my ADT system back online?

You can also reboot your system by following these steps: Be sure your Command panel is disarmed. On the panel, tap the right arrow to access the second menu. Tap Tools. Enter the master code. Tap the Advanced icon. Tap System Reboot. The screen will go blank for a few seconds, then ``Resideo'' will display.

How much does it cost to reactivate ADT?

Reactivating an ADT system requires a Test & Inspect with $99 fee. System upgrades and add-ons are available for reactivated systems at additional install and higher monthly monitoring fees.

How do I turn my ADT system back on?

A Quick How To: Power Cycle Your ADT System
  1. Open your panel and disconnect the back-up battery. ...
  2. After disconnecting the back-up battery, go ahead and unplug the power. ...
  3. Once you've done these 2 steps, put the back-up battery back in and plug your system in again.

Can I use ADT after cancellation?

Yes. Using the same home security supplies you previously purchased, you can re-establish system monitoring with Blue by ADT.

Where is the reset button on my ADT alarm?

Can you reactivate an ADT alarm system?

If you've moved into a home with an ADT system that's still working, we can reactivate it for you - just give us a call.

Can I use my ADT equipment without service?

Does ADT equipment work if I cancel the service? You must have an active monitoring subscription with ADT to use the equipment that it provides. Otherwise, you miss out on most of the functionality.

How to restart ADT?

Remove the grey bottom plate from the device. Remove the compartment cover to expose the inside of the device. Locate and tap the red button one time to reset your ADT Base. It may take a while; you will hear a sound from the Base when the reset has been successful.

How do I talk to a live person at ADT?

Call (800) 521-5456 or fill out the form and an ADT Specialist will call you about ADT and LifeShield offers.

How do I reactivate my alarm system?

If the security system has been yours from the beginning, you can probably reactivate it yourself using the security system's online dashboard or the app. If the security system was once owned by someone else, you'll need to contact the company's customer service department to reactivate the service in your name.

How to cancel ADT without calling?

Can I cancel my ADT service online? No. ADT cancellation requires a customer service phone call to 800-238-2727. During the call, the customer service agent gives you instructions and may ask you to submit a written request.

Do I have to return my ADT equipment?

You have to give ADT the opportunity and enough time to resolve the issues you are facing. Customers who opt for six months money-back guarantee also have to return all ADT equipment in their homes.

Why is my ADT system not working?

What causes a trouble signal? A trouble signal (sometimes indicated in the alarm history by the abbreviation TR) indicates a possible problem or difficulty with your security system, such as a loose wire, a poorly aligned sensor or a low battery status.

Why does my ADT system say offline?

Nov 1, 2023. Knowledge

If you log into ADT Control (control.adt.com) and see “Status Unavailable” or a graphic indicator that the system is offline, make sure all your ADT equipment is plugged in, then wait a couple minutes and try the system again.

How do I reset my home security system?

To initiate the reset process, follow these steps:
  1. Access the Control Panel. Locate the control panel of your alarm system. ...
  2. Enter the Master Code. Enter your master code on the control panel keypad. ...
  3. Navigate to Reset Option. ...
  4. Confirm Reset. ...
  5. Power Down and Up. ...
  6. Test the System. ...
  7. Check Sensors and Settings.

What happens when an ADT alarm goes off?

The short answer is that when the ADT alarm goes off, the ADT monitoring station immediately contacts the home or business owner at 1-2 phone numbers and then notifies the authorities if they don't get an answer with the correct password on the account.

How to reset ADT system after replacing battery?

Replace the battery, observing the proper polarity. Replace the motion sensor. Reset your security system by entering your code into your system and hitting off twice.

How much does ADT cost per month?

Let's recap – ADT packages start at $269. The monthly fee for professional monitoring ranges from $24.99 to $49.99. The installation fee is optional, but starts at $100. There's also a three-year contract if you get your system installed by a technician.

How do I reset my ADT account?

Visit the MyADT.com Account login page. Select "Forgot Your Password?" under the login. Select "Email" to have a password reset email sent to your email address, or select "Security Question" to reset your password and bypass the email completely. Enter the address used when registering at MyADT.com and click "Verify."

What happens to ADT equipment when you cancel?

Typically, they'll simply leave the equipment on the house, and you (or a new owner, if you sell) can re-activate service at any time. If you have existing, previously-installed equipment at your house when you start your ADT contract, that equipment is, and will remain to be, your property.

How to fix ADT cellular failure?

Moving the hub to a location by itself may improve your cellular signal. If your hub continues to indicate cellular signal issues, a reboot of the hub may be necessary as indicated in STEP 3. When system is disarmed due to cellular signal issues but still connected to power, reboot your hub.

Can you use an alarm system without the service?

Yes, it is possible to get an alarm system without a monitoring company. These types of alarm systems are often referred to as "self-monitored" systems.

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