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    Greenstar HE Combi CH but no HW - diverter value issue ??

    My Greenstar HE Combi boiler is playing up, we get CH but no HW. In fact when I turn the CH off at the thermostat, the rads stay hot, esp (or so it seems) if we run a hot water tap. From what I've read this looks like a diverter value problem. What can I do myself (if anything) to fix this. I...
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