Wont shut off
That leak at the bleeder screw is why it wont shut off. The screw might be cross threaded or it's just not tight enough. You could try putting teflon tape on the screw. Keep that screw from leaking and it will shut off. You might need a new screw. See if you can turn the valve on manually by turning the solenoid counter clockwise instead of using the bleeder screw.
Good luck!
If I can't fix it, it's broken!