I have an in-ground sprinkler system with six stations. Station six is the only one currently not coming on. When I turn on the station from the control panel, I can hear the valve opening and water flowing, but nothing else is happening. Given that the valve does come on, I'm assuming it's not an electrical issue. I also tried running the station after removing the sprinkler head that I believe to be first in the line in case there was a blockage, but nothing happened. I'm not sure what to try next. It is a Hunter SRV inline 24 volt valve. Suggestions, please? Thanks in advance.