I have an Aqualink RS controlling my 18K SWG pool. The solar collectors are located on the 2nd story roof and worked fine all last summer. Last winter I noted that the solar heat was remaining active regardless of the outside temp. I finally started troubleshooting it this past month. The JVA power is active when the system calls for heat (temperature below the set point and time of day correct). I can use the toggle switch and either bypass the solar system or send water through it. When the system calls for it to shutoff, I have no activity at the valve.
Voltage checks - System on Black - ground, Red 1.3 to 1.4 volts , White 25.6V
System off Red 1.4V dropping towards 1, White 3V dropping to 2
The dropping is much as you would get if reading across a charged capacitor.... I am concerned that this may be a sign of a failing PC board...
Any suggestions, Thanks, Jim