How do I disarm the system and clear an alarm memory?
Enter your security code and press the OFF [1] key to disarm the system and silence any alarm sounds. To clear a Memory of Alarm display, note the zone shown, make that zone intact, then enter the security code plus OFF again. For a fire alarm memory, simply press OFF to silence it, then enter your security code plus OFF to clear the display. (Page 18)
From the official ADT ADT 3000 Security System Keypad manual, page 18
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