If Detect or its open-close magnet falls off, it won’t be able to properly communicate activity to Google Nest Guard. You might see the following behavior:
- Door or window always appears as “open” in the Nest app: Even when the door or window is physically closed, the app might think it’s open because Detect and the magnet are no longer within range of each other.
- Poor motion detection: If Detect falls off a door or wall, it might land with its sensors pointing the wrong way or obstructed by the floor and furniture. Detect won’t be able to spot motion correctly until you remount and recalibrate it.