Back yard zones working; front yard zones suddenly stopped
We have a system with about nine zones all on the same controller. The five in the back yard are working fine as scheduled. The four in the front yard have suddenly stopped working.
I can manually turn the valves on the back five zones and they start irrigating. However, if I manually turn the zones on the front yard, nothing happens. I have no idea what to look for to troubleshoot the situation as I am an irrigation novice. Any help is much appreciated. Thanks in advance!