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Sorry for this post. We had a technical issue while I was posting this answer to another question. Please disregard it. I don't have a definitive answer to your issue or I would have responded already
Hello, even the Buderus dealers are hard pressed on on some of these controls issues. It is not likely that you will find anyone here with that specific experience especially in the US. In the EU Buderus is a major player, with no shortage of dealers... in the US they have less than a 1% market share so far, with dealerships sparce in many if not most areas.
In my case however, I answer a lot of Buderus questions successfully, and have 50 years experience with boilers and controls generally, usually finding a solution one way or the other, you can give it a try if you like. You are not ask to rate my work (I get paid in that case) unless you are happy with the results.
If you want to give that a try, tell me how long you have had the boilers and when the problem began, and which direction you are from the center of the nearest city ..... and what the buderus dealer had to say about the problem.
We can go from there if you wish, otherwise please hold your rating it will only delay your response from other of our boiler techs here.