How Can I Modify the Code for My ADT Alarm System?

Quck answer

To change the code for your ADT alarm system, follow these steps:

1. Access the control panel: Locate the control panel of your ADT alarm system. It is usually found near the main entrance or in a central location in your home or business.

2. Enter the current code: Use the keypad on the control panel to enter your current code. This will prompt the system to enter programming mode.

3. Access programming mode: Once you’ve entered the current code, press the “Program” or “Code” button on the control panel. This will allow you to access the programming mode.

4. Enter the new code: Use the keypad to enter your desired new code. Make sure to choose a code that is easy for you to remember but difficult for others to guess.

5. Save the new code: After entering the new code, press the “Save” or “Enter” button on the control panel. This will save the new code and exit programming mode.

Remember to test the new code to ensure it is working correctly. If you encounter any issues or need further assistance, contact ADT customer support for guidance.


Having an alarm system installed in your home or business can provide an additional level of security. However, if too many people have access to your alarm codes, it can pose a security risk. This is especially true when you have former employees or individuals who were given a code but no longer need it. The ADT alarm system allows you to easily change the Master Code as well as the codes assigned to sub users.

Master Code

Step 1

Enter the current Master Code for your alarm system.

Step 2

Press the combination “8” + “1” on the alarm keypad.

Step 3

Enter the new Master Code you wish to use.

Step 4

Confirm the new Master Code by entering it again. The alarm system will emit a beep sound to indicate that the Master Code has been successfully changed.

Sub User Account

Step 1

Enter the current Master Code for your alarm system.

Step 2

Press the “Code” key.

Step 3

Enter the user number assigned to the code you want to modify. For example, user number 02, number 03, or number 04.

Step 4

Enter the new four-digit code you want to assign to the user. Once you have entered the four-digit code, the alarm system will emit a beep sound to indicate that the code has been changed.

Leave a Comment