I have a zone that automatically turned on today, the timer is not engaged. I think maybe the solenoid seat is not sealing properly.

The only way I could stop the water is to turn the valve's flow control all the way down, but even then I hear a slight hissing from the valve.

Here is what puzzles me, when I took out the solenoid and water gushes out from the solenoid hole at a slow rate, I am not sure if the valve needs replacing. Now the flow control is all the way turned as far as it goes down.

I took out the solenoid on my other valve (flow control all the way down) and found the same thing, is it normal for a small amount of water to flow through the solenoid's hole? Or is the flow control knob getting too old?