Just finished installing a Rachio 3 to replace an existing “smart” irrigation controller. The reason for doing this was the old one, while it would use a Hunter Mini-Clik rain sensor, would not report or notify when it was tripped.
When Sensor 1 is enabled, the Rachio 3 repeatedly sees the sensor triggered, cleared, triggered, cleared, triggered, cleared, ad nauseam.
I tried adding a 0.1µF disc capacitor across the sensor terminals. Did not solve the problem
Unsurprisingly: The Sensor 2 input does the same thing.
I put a digital multimeter across the rain sensor’s leads. Measures 0.5Ω. I’m seeing 2.1mV AC across the leads, intermittently. (I assume that’s noise from nearby AC wiring. This is all adjacent to the home’s electrical service entry and breaker panel.)
Is there a solution to this problem that does not involve replacing a perfectly good rain sensor?