I have what I think is an issue with my suntouch controller which I believe began last year.
The controller is programmed to run the pump X # of hours per day, turn on the solar valve when heat is available on the roof and finally freeze guard is ON although now we are basically past the danger of any freezing. The issue is the controller turns the pump off for a 1/2 minute or so a couple times per hour. Any suntouch experts out there, is this normal? I do not remember it doing that the first couple of years I have the system.