The humming automated jandy valve, should have a toggle switch on the back-side. Flip it the other direction. Does the valve move? If yes, great, it may not need to be replaced, but adjusted. If no, then it will have to be replaced. A relatively simple repair. You could do yourself. The expensive part will be the automated valve itself. Youre probably looking for a JVA24 by Jandy ( a little more expensive), or a CVA24 by Pentair Water. Follow the black cord up and into the control panel and carefully remove the lead. Paying attention to where it was removed from. You'll also want to remove the actuactor itself (the motorized part) 4 screws hold in onto the 3 way jandy valve. Note the orientation of the actuator. You may also have to adjust the stops on the actuator. Open up the case on the old actuator and look at where the stops are located on the valve stem. Compare to the new actuator valve stem and adjust accordingly. By the way you're doing all of this with the power shut off to the entire pool / spa equipment panel. Its probably a 30 minture repair for a qualified tech, for you maybe an hour.

Holler if you need help. where are you located by the way?