I do not see any specific support on Rachio 3’s compatibility with Rain sensors. There is some generic statements out there from Rachio but nothing specific even though they say that it is compatible with most rain sensors.
I had opened a support ticket requesting specific help on how to wire the Orbit Wireless Rain Sensor model 57071 receiver to the Rachio 3 connectors. It’s been over a week and they haven’t responded yet.
Not sure if they are really that busy or they just don’t want to resolve the issue.
If any one else has installed the Orbit Wireless Rain Sensor, please let me know.