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    Vaillant combi boiler overheating

    Hi, I have been having a problem with my Vaillant combi Boiler. It is a VCW sine 18 T3WF-H. The problem I have been having is that the boiler overheats. I have to open the panel to push the overheat reset button to get it working again. It the heater also does not come on when you turn the...