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    Vailliant EcoTech Plus - water ok, not CH.

    My EcoTech plus 834 boiler seems to have packed up the heating, showing the Summer Active Mode, showing code 5.0 and 5.3.1, although I have hot water. Can someone tell me how to switch it back to normal winter Active Mode, and i have magnaclean fitted after the whole system had a powerflush...
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