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I have Range Tribute HE dual coil boiler, Honeywell F8 valves(2), and Grundfos UPS (which I presume is pump). It also has solar water heating panel system connected to it. Thanks for your help.

Pete, thanks for the reply. The problem is that I have very brief knowledge of CH and HW systems. Where normally that valve is, and what does it look like (-ish)? Thanks

Hi guys, I have LP722 controller, which was working fine until this autumn, but now it has developed a fault-it will only turn on either hot water OR heating, and I have to play with the control buttons to get either working. Both will not work at the same time, although bot red indicators will...