@Jwlewis82 - These in-line with the common wire rain sensors will be the death of @mckynzee - looks like there should be a special knowledge base article on this!
So based on the reply I'm assuming a Hunter Mini-Clik rain sensor has been spotted in the installation. If so, here are my recommendations:
- Cut the rain sensor out of the common wire and wire-nut together the common wire using a damp location wire nut available from Lowe's and Home Depot.
2a. If the desire is for a local rain sensor to catch the situation where it rains locally, but not at the chosen weather station then wire the rain sensor into the SC and S ports on the Rachio device.
2b. If the internet based weather station is fine for rain detection, then leave the rain sensor out and remove a failure point.
Otherwise, one will always be fighting the rain sensor if the sprinklers aren't running.