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How to Disconnect Your ADT Alarm System

This article is a collaborative effort, crafted and edited by a team of dedicated professionals.

Contributors: Muhammad Baballe Ahmad, Mehmet Cavas, Sudhir Chitnis, and Zhen-ya Liu.

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So, you’re moving out and need to know how to disconnect your ADT alarm system. We’ll walk you through the process step by step so you can cancel your service without any problems.


Preparing to disconnect your ADT Alarm System is essential for a smooth, successful process. This includes gathering the necessary tools, disconnecting the system from your home’s power, and learning how to reset the system after disconnecting it. Taking the time to properly prepare before you begin to disconnect your system can save you time, energy, and money.

Gather the necessary tools

In order to disconnect and deactivate your ADT alarm system, you will need to gather all of the necessary tools before beginning the process. This includes a screwdriver, a flathead screwdriver or a Phillips-head screwdriver depending on which type of screws you have. You will also need pliers and wire cutters for cutting any wires that are connected to your system. Additionally, if you have an ADT wireless alarm, you may need to obtain special tools that can access the internal components of the device. Make sure that you have all necessary tools within easy reach before proceeding.

Ensure you have the correct user manual

Prior to disconnecting an ADT alarm system, it is important that you read your user manual and/or contact customer service for detailed instructions as the steps may differ depending on the model. When contacting customer service, be sure to have the make, model and serial number of the alarm system on hand for reference. Additionally, take note of any warnings or instructions that are specific to your individual system in order to ensure a smooth and safe installation process.

System Disconnection

When it’s time to move or upgrade your ADT alarm system, disconnecting it is a necessary step. Doing it correctly ensures all your components are properly unpaired and ready to be reinstalled in a new home or upgraded in your current one. Keep reading to learn the steps you need to take to disconnect your ADT alarm system.

Turn off the power to the alarm system

Before disconnecting your ADT Alarm System, it is important to safely turn off the power to the system. To do this, locate the power switch that runs to your alarm system. This switch might be found on a wall near where your alarm panel is mounted or in a presence near the main power outlets of your home. If you do not know where this switch is located, please refer to the owner’s manual or contact ADT customer service for help.

Once you have located the power switch and safely shut off the power to your alarm system:
– Make sure all of the wired connections from any sensors and/or devices attached to your system are disconnected. Unplug any exposed wire that may feed into an external microphone device.
– If applicable, disconnect and unplug any telephone line connections in addition to other communication lines that feed into your ADT Security Hub.
– For added security measures, you may remove all backup batteries from any smoke detectors and/or other devices associated with your alarm system before disconnection is complete.

Disconnect the alarm system from the wall

Once the wiring process is complete, you will need to disconnect the alarm system from the wall for power. First, locate the Control or Operation Panel. This is typically mounted on a wall near an entrance of your home and looks like a slim-box or door entry panel. The wiring should be connected to a battery and transformer. Disconnecting these two components is fairly easy but you should take care to avoid damaging any of the parts.

Start by disconnecting any batteries or auxilary power sources that are connected to the alarm system’s control panel. On some systems, a battery might be contained in the same box as the control panel while on others, it may be external and very small in size. Carefully remove any cables connecting these batteries or auxilary power sources from both ends and set them aside for safe-keeping until you connect them again later.

Next, locate your transformer and unscrew it to remove it from its wall mount if present. Disconnect the wires one at a time by carefully pulling them free from their connections – this should easily expose where each wire was affixed earlier during installation. Gather up all these parts and place aside for future connection when needed. Congratulations – you have successfully disconnected your ADT Alarm System!

Disconnect all wiring from the alarm system

To disconnect your ADT alarm system, you must first disconnect all wiring from the alarm system. This includes unplugging any plug-in communication modules such as telephone jacks or cellular modems. Additionally, you must also remove any wires connected to doors and windows sensors, motion detectors and other external devices. Be sure to note the location and routing of all wires before disconnecting them so that they can be re-attached in the proper configuration after disengaging the system.

Once all connections have been removed from the system panel, you are ready to move on to step two in your ADT Alarm System Disconnect process – power down.

System Removal

Removing an ADT alarm system is a relatively simple task, but it should be done in a systematic way to ensure that all of the components are properly removed. In this section, we’ll cover all the steps required to disconnect and remove the system, as well as discuss issues that may arise during the process.

Remove the alarm system from the wall

Removing the alarm system from the wall is simple, but it requires you to take some safety precautions in order to protect yourself and the alarm system. Make sure you turn off the power source to your alarm system before attempting to remove it. This can be done by switching off the circuit breaker in your home’s service panel or by unplugging the main power source.

Once all of your power sources are turned off, begin removing screws and artwork covers from around the alarm system until it is exposed so that you can get access to all of its wiring connections. Now, pulling gently on each wire connection, disconnect them one by one until all wires have been removed. It is important to note which wires were connected where since some may be connecting more than one location on the same device. After all wiring connections are disconnected, you can now unscrew any other screws that hold the device into place and remove it from your wall.

Unscrew the mounting plate from the wall

To begin the process of disconnecting your ADT alarm system, you must unscrew the mounting plate from the wall. You will need to use a screwdriver or other tool such as a drill to safely remove the screws that hold the plate in place. Once all of the screws are removed, you will be able to take out the primary panel and wiring harness by carefully tugging on it. Remember to be gentle with your equipment in order to avoid damaging any components or wires. Once you have taken out all of the pieces necessary for your removal process, you can move on to disconnecting your system from power.

Remove the alarm system from the mounting plate

Removing your ADT alarm system from the mounting plate may be necessary if you’re moving it to a new location, replacing it with a newer model, or just need to do some troubleshooting and maintenance. Before you start, make sure the power is turned off at the breaker box.

Gently pull the alarm system away with both hands until it releases from the mounting plate. You’ll want to use gentle upward pressure as you pull outward until you hear a “click” signaling that the magnets have released their hold on each other. If any part of the mounting plate remains attached, carefully twist and remove each component separately.

Once the alarm system has been removed from the mounting plate, take care not to force it into a new position or cause any further damage. Be mindful of all cords and wires connected to your ADT alarm system so that they are not tugged or torn as you move your system. After placing your alarm in its new location and reattaching it securely to a wall or bar shelf with double-sided tape or screws (as applicable), double-check all settings before reconnecting power to ensure optimal security protection in your home!

Clean Up

When it is time to disconnect your ADT alarm system, it is important to properly and thoroughly clean up any wiring, panels, and sensors. This will ensure that your house is safe and secure and that no malfunctioning components remain. Let’s explore how to effectively and safely disconnect your ADT alarm system.

Vacuum the area around the alarm system

Before beginning the process of disconnecting your ADT alarm system, you must make sure that the area around the equipment is clean and free from dust and debris. To ensure optimal performance for your ADT equipment, it is important that dust and other particles do not interfere with the flow of electricity. The best way to ensure that this does not happen is to thoroughly vacuum the surfaces near the system — including floor space, walls, furniture and countertops. You also need to clean any air vents or fans located in your home to prevent airborne contaminants from entering the system while you are performing maintenance. Take care not to use too much water when cleaning these areas as this can cause short circuits on sensitive components.

Place all components in a safe location

Once you have disconnected your ADT alarm system, it is important to place all components in a safe location until you are ready to discard them. Disconnect the backup battery carefully and securely package it along with the control panel in a sturdy cardboard box. Also, take any additional parts or sensors, such as window and door contacts, smoke alarms and CO2 detectors, and store them away safely until you’re ready to dispose of them. Proper disposal or recycling of your ADT alarm components is important – either check with your local municipality or follow the instructions provided in the manual on how to properly discard these items.

Dispose of the alarm system properly

Once the system has been disconnected, it is important to dispose of the remaining components properly. ADT recommends disposing of parts in compliance with all applicable current local, state and federal laws and regulations. All components, such as siren boxes, wall sensors/detectors, control panels and keypads should be recycled or disposed of in accordance with local environmental laws. Batteries should also be disposed of properly; for proper disposal instructions or recycling locations please refer to the manufacturer’s website.

How to Disconnect Your ADT Alarm SystemCheckout this video:

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