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Thanks - I'll have a play when I get home, but think I'm going to have to find a plumber.

Hi, We have the following system: Ideal Icos HE12 boiler Danfoss CP715 control panel & thermostat Heatrae Sadia Megaflo unvented indirect cylinder Grundfos UPS 15-60 pump Danfoss HPA2 valve (switch set to automatic - what does this even do?) Essentially everything's working ok...