This is the beginning of a blog devoted to a problem experienced by some owners of Vaillant 400-series boilers in the UK, whereby the boiler cycles on and off rapidly and repeatedly under certain circumstances when used with weather compensation controls.
Please explore the pages on the tabs above entitled "The problem" etc for more details, and to see what we know already and what we don't. We're particularly keen to make contact with others who are experiencing the problem, and for them to add details of their systems to the area accessible through the page called "Info from owners with the problem".
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