Entry sensor doesn't show closed on sliding door
I've installed my system, including 14 entry sensors, but I'm unable to get the contacts on my sliding Andersen patio door to establish that the door is closed even though the led flashes correctly when opening and closing (and the base station acknowledge opening). I've tried troubleshooting through SS and they sent me a replacement set but that does not behave any differently. I've mounted the sensors at different areas of the door and frame but still can not get a consistent status - invariably the keypad and status show that the door remains open even though it is closed.
Is there any possibility that these sensors have conflicts with certain materials?