Howdy!

I recently purchased a Spark 16 and have wired it in to a current srinkler system which was working fine with an old Toro controller. 

The Spark is acting very unusual, compred to the old system. As per the instruction booklet, I wired 8 wires in Zone 1-8 for the 8 sprinkler zones which are being used. I then wired the 24VAC and Common wires (x3)  in without an issue.

At first, both manual, smart and program modes worked with no issue.

I then tried to run a manual start with each zone runnig for 1 minute as a test. The app seemed to not be able to turn off the manual program if I hit the stop button in the app.

The unit was acting like there was no issue (valve test and server test on the app all looked fine), but if a program was due to run, the unit woudl display that a zone was active/watering, when it clearly was not watering or active.

I then did a full reset and install of the unit, and am still having the same issue.

The sprinkler wiring has 3 common wires - if I wire them all into the left hand side C wire port on the Aprk, it seems to struggle with turning on any zones at all, but intermitterntly. If I wire two of them into the left hand side C port, and one of them into the right hand side C port, the spark cant seem to turn off the sprinklers after they have turned on.

Help! It seems to be a common wire issue, and the app/unit also seems to be buggy.