I have a Rachio 3, 12-zone. I installed a Rainbird WR2 over the weekend. Rainbird appears to be functioning (there doesn’t seem to be a way to test it manually, but the temperature reading appears correct, all displays functioning, etc.) But whenever I enable S1 on the Rachio it goes into ‘Rain sensor on’ mode and skips all schedules. I left it on for a couple days and the setting never cleared. There was no rain that occurred during this time and the temperature stayed above the setting on the Rainbird. The display on the Rainbird shows that the controller should be in ‘normal irrigation operations’ and not blocked.
Dual function “rain” sensors appear the same to Rachio, no matter if they are tripped by rain or temperature. Is your outdoor temperature below the set point for the freeze protection?
According to the Rainbird Specifications “ The sensor shall be wired to normally closed (N.C.) controllers – in series with the valve com- mon, or alternately, wires shall be inserted into the appropriate controller sensor terminal ports.“
Since the Rachio instructions say “ * Sensor ( S1 , S2 ) terminals - use S1orS2 for a single sensor, NOT both
Sensor common ( 24 VAC - ) terminal. This corresponds to the SC terminal on the Generation 2
Sensor power ( 24 VAC + ) terminal - for wireless (powered) rain sensors . This corresponds to the SP terminal on the Generation 2.”
I believe you should move the white wire from 24v- to SP2 as it appears that the white wire is the rain sensor wire and should be connected to a sensor terminal not the common terminal.
I’ve sent my Rainbird WR2 unit back because I do think it was faulty (it wouldn’t trigger the rain sensor on it’s own controller even after dousing the sensor.) Hopefully the replacement unit will “just work”. I’m still not convinced there isn’t something wrong with my Rachio sensor terminals, but testing it with a replacement Rainbird will give more insight.
I have a Rachio 3 – which by the documentation linked above, I have wired the WR2 to the Rachio correctly.
Final followup. It turned out my original Rainbird WR2 was bad. After getting a replacement unit and following the Rachio Gen 3 wiring guide, everything is working as it should be.