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The Daily Insight

How do I change the code on my ADT alarm system?

Author

Samuel Coleman

Published Feb 25, 2026

How do I change the code on my ADT alarm system?

How to change you alarm master code on a ADT keypad

  1. Get a green ready light.
  2. Enter your current 4 digit code.
  3. Enter 802.
  4. Enter your new 4 digit code.
  5. Enter your new 4 digit code again.

How do you remove ADT alarm code?

On your keypad, press *5 and your master code. Enter the two-digit code, press *, and then the four-digit code you wish to erase. Press the star (*) button again and hold it down until the panel beeps. The temporary code is now erased.

How do you change the master code on an alarm system?

Only the main user of the alarm system can change the master code. Here are the steps to do it if you know the default or existing code: Enter your current master code. On Vista systems, the default code is 1234. Press 8 (the CODE key). Press 02. Enter a new four-digit master code.

How to add, delete, and change alarm codes?

The first step is Start where the process of adding, deleting or overwriting your alarm codes begins. To do that, press *5 on your keypad followed by the Master Code. If you have a new alarm model, the lock should show a red light. As for the older models, the armed light should go red and the word Program should flash.

When do I need to change my Honeywell alarm code?

As a Honeywell alarm system owner, one of the things you need to learn is how to change its code, especially if the default master code has not been replaced yet. If you haven’t done so, you’d better change it before a burglar breaks in using your easy-to-guess default code. What is a master code?

How do I change the security code on my computer?

On Vista systems, the default code is 1234. Press 8 (the CODE key). Press 02. Enter a new four-digit master code. Re-enter the new code. The keypad will beep once to let you know that the code has been changed. If you don’t know the installer security code, you can still change it.

Only the main user of the alarm system can change the master code. Here are the steps to do it if you know the default or existing code: Enter your current master code. On Vista systems, the default code is 1234. Press 8 (the CODE key). Press 02. Enter a new four-digit master code.

The first step is Start where the process of adding, deleting or overwriting your alarm codes begins. To do that, press *5 on your keypad followed by the Master Code. If you have a new alarm model, the lock should show a red light. As for the older models, the armed light should go red and the word Program should flash.

How do you change the codes on a Honeywell alarm system?

To change the codes on a Honeywell alarm system, you will follow a certain process depending upon the system type. A panel with a numeric keypad, such as a Honeywell Vistaor an L3000, will have a different process than a touchscreen system, like a Lynx Touch panelor a Lyric Controller.

On Vista systems, the default code is 1234. Press 8 (the CODE key). Press 02. Enter a new four-digit master code. Re-enter the new code. The keypad will beep once to let you know that the code has been changed. If you don’t know the installer security code, you can still change it.