Hello

I have a Rain Bird Anti Siphon style valve. When the station turn on via the timer the flow is very low. Its so low the sprinklers barely pop up, a couple dont even come up at all, they just bubble out water.

If I turn on the valve manually by rotating the solenoid to the "on" position or by opening the air valve, the sprinkler come on full bore, like they should.

Could it be a weak Solenoid, or faulty valve?

What should I do??

Thanks for you help!