I know this is an old thread, but I have a similar problem with the Vitotrol 100-e handheld unit. I don't have this problem with the ViCare app (version 3.39.0) on an Android phone (English/Ireland) - I guess the problem reported above has been fixed in the mean time. However, our Vitotrol 100-e always shows the previous day on the display - this photo was taken on Friday 26 June 2026: I have read the long version of the User Manual for this device and there is no way to set the date - I assume it gets the date from the main unit. My guess is that whatever software bug caused the problem reported by the OP here, the same bug is also present and has not been fixed on the Vitotrol unit (SW version 0033-0000 19). If someone at Vießmann is reading this ... and if I'm not missing something obvious ... please create a task for your SW developers to fix this bug. Vielen Dank.
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