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I don't think the issue is the collector temperature probe. It wasn't touched as part of the works. I have also put a pipe clamp thermometer next to it and it registers the same thing - a temperature drop at the top of the collectors until such time as the pumps are manually restarted and then...

I have a solar thermal system with a Resol Delta Sol BS Plus controller. I have recently had some works done to the system and since then it does not appear to be functioning properly and I wondered if anyone had any ideas about what could be wrong. The issue is that when the system’s pumps...