Your solar thermal installation is controlled by a differential controller, meaning it is looking for a set criterion of figures to operate. The circulating pump should only be active if there is a 10ºC difference between the temperature shown for the sensor in the panels and the sensor in the bottom of the cylinder. You can view these temperature readings on the solar thermal controller and cylinder controller respectively. If the temperature reading are outside of these parameters then please contact your engineer for further guidance.
The information provided here is advice only - if you are not happy to check your product, please contact a heating engineer to assist.
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