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Thanks for all the information. I really appreciate it .

Thanks for the really quick response and explanation. So in very layman terms, if i kind of understand it, if the actuator isn't moving correctly due to the value sticking then it keeps sending voltage to the boiler and the boiler caries on heating the water and will do until the actuator...

Hi I've got a similar issue to above. I've just had a brand new bog standard boiler installed (Vaillant - ecoTEC Plus 424). Not sure of the technical name of the system I have, but its old school with a storage tank and expansion tank in the loft and absolutely no trendy wifi technology in the...