I’ve had my Rachio 2 up and running for about 8 month, it was working fine until recently I noticed that in my zone 3, which includes 5 sprinkler heads, two of the heads do no pop up while this zone is running. If I pull them up by hand, water comes out as normal, but they retreat back to ground if my hand is off.
Other three heads in the same zone are running fine without pressure issue, other zones are also fine. I am wondering what would be the cause of the problem? The valve and heads are both pretty new, just installed with the controller.
Any ideas or suggestions? What might be wrong and what may I check? Thanks!