Enter * 20 <pause> Enter your new four digit installer code.

The keypad will chirp three times and advance to "Quick Arm" at location 21.

It's important that you know the installer code is correct, so do the following:

Enter # 20

Your new four digit installer code should flash across the screen. Each digit will have a leading 0, so,  If your code were 2468 it would be displayed as:

02 - 04 - 06 - 08

The keypad will chime three times on the last digit.