New to this forum, but not to forums in general. I have a Goldline GL-30-LCO SunEarth INC electrical solar control which switches the Grundfos pump for my Solar Water Heater. I have replaced this several times for this issue but there must be a better fix. The present controller is less than 2 years old. At present, it makes the pump run full-time on. I have not found similar threads on this forum.
What the system is set to do via a dual thermistor type thermostat, when the difference between tank temperature and the roof grid is 12 degrees, it turns on the pump which then circulates the hot water back into my tank until the difference in temperature is 4 degrees (Fahrenheit). Then it shuts off the pump. My controller for some reason abruptly has started running full time, so the water constantly circulates between the tank and the roof, no matter what the water temperature is. The previous time this happened, as well as now, I was unable to "reboot" this by unplugging for several hours, then plugging the controller back in. My thermistors seem to be okay, it is as if some relay type element in the controller is stuck, and it just keeps the pump running full time.
Can anyone help me troubleshoot this, rather than just replacing the whole controller every few years? Happy to hear your thoughts and suggestions.
What the system is set to do via a dual thermistor type thermostat, when the difference between tank temperature and the roof grid is 12 degrees, it turns on the pump which then circulates the hot water back into my tank until the difference in temperature is 4 degrees (Fahrenheit). Then it shuts off the pump. My controller for some reason abruptly has started running full time, so the water constantly circulates between the tank and the roof, no matter what the water temperature is. The previous time this happened, as well as now, I was unable to "reboot" this by unplugging for several hours, then plugging the controller back in. My thermistors seem to be okay, it is as if some relay type element in the controller is stuck, and it just keeps the pump running full time.
Can anyone help me troubleshoot this, rather than just replacing the whole controller every few years? Happy to hear your thoughts and suggestions.