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Door and Window SensorMy Door and Window Sensor is causing a false alarm

Door and Window Sensor

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My Door and Window Sensor is causing a false alarm

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Verify the placement of the Door and Window Sensor

The Door and Window sensor is looking for a ¾ inch or greater separation between the transmitter and magnet for it to trigger an alarm. Check the following if your sensor has triggered a false alarm:

  • Ensure both the transmitter and magnet are still present on the door/window or frame

  • Be sure to verify when the door is closed that the arrows on the two pieces are perfectly aligned, within a thumb’s width and flush

  • Ensure there is no play (movement) in the door or window when it is closed

  • Ensure that the notches are lined up directly across from each other

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