Steps to troubleshoot this can be found in the thread below:
I have copied the relevant steps below:
If status is falling:
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Verify that the included tilt sensor is attached to the garage door.
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Attempt a re-sync of the tilt sensor with the Linear Z-Wave Garage Controller.
- Press and hold the link button on the Linear Z-Wave Garage Controller for 7-8 seconds until a short beep is heard.
- Open/close the garage door opener locally (with remote/wall button) so that the sensor moves. If it re-syncs, you should hear an additional beep.
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Finally, delete, factory reset, and re-add the Z-wave garage device. Run a network rediscovery after pairing the device.