I have a solar heating system with Pentair SunTouch controller with Pentair CVA-24T valve actuator. When I swam a few days ago, everything worked fine then. But this morning I noticed that even though the controller activated "solar", the valve didn't move. I turned off and on the pump again and solar was activated immediately but valve didn't move.
This is a fairly new system that was installed two years ago.
1. What are the first things to check? How can I isolate the issue (is it the actuator? Or some wiring issue? Or controller? Or actually something inside the pipe?)?
2. Is there a switch or anything in the actuator that allows me to turn the valve manually?