Intelliflo VS pump, SunTouch controller, Compool CVA24T solar diverter valve.
Everything seemed OK. But with solar "off", and isolation valves closed, I noted some water dripping from drain on the pipe taking water up the wall to the solar. I closed the drain, opened the isolation valves, then, what the heck, decided to test the automatic solar actuator. I turned the solar "on" using the SunTouch controller. The valve started rotating in the correct direction. So, I turned it "off", but the actuator handle was still at about 90 degrees, when it should have returned to the closed position. So, I turned it "on" again, and it moved to fully open, and there it stays. No matter what I do with the controller, including flipping the little toggle switch up, down, middle, it won't budge. The self test on the SunTouch does not show any problems. Now I've got water going through the panels, which I really don't want, since it is too early yet, and to maintain flow, I've had to increase the RPM.
Is this a controller problem, or the valve actuator, or the valve components itself stuck from debris or ???