Hello Dr. Klaus Hahn! I also encountered the overwriting problem, on a system consisting of Vitodens 100 + ViCare climate sensor. Although I'm from Romania and I'm not accepted on this forum (discrimination from my point of view), I sent the problem out of the desire to show that users outside of Germany were also affected. I think that the problem was generated by a firmware update, which was visible in the ViGuide event log and which today is no longer visible -> lack of transparency. Like you, I am generally satisfied with Viessmann's "physical" products. But the software, at least in my situation, is dust. You have the link below. Temperaturainstellungen wurden zurück gesetzt Draw your own conclusions. Regards, Sebastian Vlaicu
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