I have same setup and same behaviour in Heating Circuit 1 (time program mode). My normal mode setpoint is 22°C. Vitotrol show summer eco mode (vito vicare shows summer 🙂 when room temp is at or above setpoint. While in eco mode, I temporarely increment setpoint to 23 and back to 22, Vitodens resumes normal mode and it keeps that mode even at room temp 22,6°. (Param 933.6 is set to 1, and 933.7 to 8 which is low (also tried with 4)). There must be bug or very unusual correlation curve of param 933.7 to hystereris in PID loop. Local support office was rather ignorat to questions and my case.mails. It would help to get an Viess expert help explaining behaviour or recommend solution. Until then my workaround is shorttime trick to Vitotrol. Heating Circuit 2 works flawlessly, however only driven by outdoor temp. Regards, Aleks
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