It took me sometime to figure out that the reason for the cold water was the wrong date-time in my heating system. This was probably caused by a power out problem we had in the region 2 days before. The system is around 5 years old and had other power out cases in the past without loosing the date/time setting, but not this time. I manually entered the correct values in the touch panel and everything is working fine since then.
My question here to the community and Viessmann support: is there a way in the API to (1) read the current date/time setting in the heating system (2) set a new date/time (3) synchronize it with an NTP server?
