Hello, What vitodens 200 du you have? A new one with the new control technology? Or an older one with vitotronic controller the parameter for the vitotronic is in coding level 2 . Code 59. the default value is 0 with a difference of 2,5K below the setpoint. for the new controller check parameter "1085.0 „Speicherbeheizung: Einschaltpunkt Sollwert“" the uper hysteresis can not be changed. BR
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