If the solenoid hums, it MAY not be the solenoid. Inside the valve is a rubber diaphragm that must move when the solenoid opens. I would remove the solenoid, make sure the plunger is inside and, while retaining the plunger, apply power. If the plunger is pulled into the solenoid, it is probably not the solenoid. MOST solenoids have the same threads but all do not and you must get the same dimensions.
Most valves have repair kits that allow you to replace the diaphragm & a few other minor internal parts.
Good Luck,
Gary
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