What should I do if the touchpad beeps rapidly when I enter my home?
Rapid beeping at the touchpad upon entering indicates that an alarm has occurred during your absence and an intruder may still be on the premises. You should leave immediately and contact the police from a nearby safe location. Do not enter the premises if the main burglary sounder is also on. (Page 8)
From the official ADT ADT 3000 Security System Keypad manual, page 8
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