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Hello the vitodens is a very complex boiler with two micro computers operating it, it is anything but a do it yourself project. Its a fine german made boiler but not well established in the US so far, if you are lucky your local dealer will still be in business and has sent one of his techs to the vitodens boiler school.
Tell me which direction you are from the center of the nearest city and I will attempt to locate a dealer for you, or if your dealer is still around it will be a good idea to call him for this particular problem.