Enter your four-digit passcode into the Monotronics control panel keypad. Press "Enter." If an alarm has sounded and is still sounding, repeat the passcode so that the alarm goes off.
Verify that all of the windows and doors that are wired to the Monotronics security system are closed. Press the "Door and Windows" button on the control panel once. If the green "arming" LED does not light up, press the button twice instead to illuminate the green "arming" LED.
Call the security center. The number should be with your Monotronics security system information. Provide them with proof of your identity. Inform them that you have reset the security system and that any notice at their end should be treated as a false alarm.