Zone only comes on intermittantly
Station 1 has not been coming on regularly. Sometimes, we can get it to come on by using the manual setting through the control box, but sometimes even that does not work. We have checked the voltage for station 1 at the control box and at the solenoid, both at about 23 volts. The resistance at the solenoid itself is steady for several seconds at about 26 ohlms. The other 8 stations seem to be working fine.
When we manually turn the actual solenoid to open the valve, the only thing that happens is water will begin to leak from the valve after a turn or two. Do we need to have the station turned on AT THE CONTROL BOX to get this test to work? Or should unscrewing the solenoid a quarter turn cause the sprinkler heads to pop up even if we have not requested that station to be running at the control box?
What do you believe could be the problem? Thanks for any advise you can provide!