Enter your four-digit master code via the control panel's number buttons. Press "Code" when you finish.
Enter the single-digit user number assigned to the code you want to change. For example, "2."
Wait a few seconds; the control panel beeps when the code is deleted.
Re-enter the master code, as in step 1, and press "Code."
Re-enter the same single-digit user number selected in step 2.
Enter your new four-digit code using the number buttons. The control panel beeps once when the code is accepted.
Use your new alarm code. The system instantly accommodates your new settings.