I have a Vitodens 200 installed in my House and it has to now been running very well. At the begining of this year i.e. 2022 I noticed a change in the heating te(perature in our home. I checked all the settings and nothing has changed. However, the heating seemed to be comming on at the wrong time and the DHW was available at the wrong time. During the yearly service, the boiler was checked and this fault was not visible. Today as I sat down with a pen and paper and regstered the boiler behaviour, I noticed that everything is happening with a one-hour delay. i.e. the DHW was to come on at 12:30 (hot water for cooking lunch), but instead it turned on one hour earlier. How on earth is this possible? Is this a known problem with a calendar problem i.e. when the date changed from 2021 to 2022? Has anyone experienced this problem or is just me?
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