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Bob M.

wrote:
I changed the red one to green with no luck. Do you need direct
sunlight? How does it work during the night? Let me know.

What he meant is "is sunlight blinding the sensor?" This can happen when
the sun is shining directly into one of the two sensors - they don't have
enough power to overcome the brightness of the Sun.

Also, the two sensors are not the same though they may look the same. One is
a transmitter and the other is a receiver. Did you happen to install two of
the same kind? If so, that will cause a problem.