This is typically caused by a mounting issue with the sensor. Please check the following:
- Verify that one piece of the sensors is mounted on the door or window and the other piece is mounted on the frame.
- Both pieces must be mounted on the handle side of the door/window and not the hinge side.
- Ensure that both pieces are separated greater than 3/4" when the door or window is opened
If the issue persists after the mounting has been verified, then please contact Customer Support for further troubleshooting assistance.