My Iro replaced a very old Rainbird timer (rotary dials) that was broken when I moved into my new house. As it was poorly documented it’s been a bit of trial and error to figure out what goes where. I’ve mostly accomplished that, but I’ve got one wire that doesn’t seem to belong anywhere.
My system appears to have eleven zones (the Rainbird went to 12)
I have 10 red wires and 3 white wires at the controller.
I guessed the common wire on the first try because hooking that up plus a random red wire got a sprinkler zone to come on.
Every red wire plus the white I plugged in to common activates a different set of sprinklers.
One of the 3 white wires activates a zone, so they clearly ran the wrong color to at least one of them.
This leaves me with a single white wire that I cannot figure out what it’s for.
Plugging it into zone 12 and turning that zone on puts the Iro into an error state (wifi blinks red and amber and Iro drops offline until I unhook that wire and reboot the Iro)
I cannot find any more sprinkler heads in my yard.
Every other sprinkler head works just fine with the single common wire I have installed.
Does anyone have any idea what this other wire is for?