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For the moment I have also performed a change in the code in order to ignore the 'max CHsetp upp-bnd' reported by the boiler in MessageId49 and set it to a hardcoded value. ;Keep track of the boundaries for central heating reported by the boiler MessageID49 btfss MsgResponse return bcf InitHeating ;...

Thank you very much for providing all the details. I confirm that using this workaround it works now.
A similar problem, also related to a Viessmann boiler, is discussed here: viewtopic.php?f=75&t=12647

I have issued the suggested commands (UI=49, UI=6 and also DA=49, DA=6) but the behaviour is the same. From the log it seems that MsgID=6 is still requested once, but MsgID=47 is not there any more. I am able to use SH=X only just after I perform a gateway reset (GW=R), afterwards it is only possibl...

I have attached a log file. Some relevant timestamps are: 22:08:29.777034 SH: BV 22:08:45.794170 SH: 40.00 22:09:08.778660 SH: BV 22:09:18.776860 SH: BV where I have issued the following commands: SH=50 SH=40 SH=44 SH=43 If necessary I can also provide additional information or issue custom commands...

Hello, After setting the Max CH water Setpoint to a certain value (using SH=X) I am not allowed to set it again to a greater value than the current one (for example SH=X+1). Response from gateway is BV(Bad Value) I am only allowed to set to a value less than the current one (for example SH=X-1). In ...