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Hello,

I have iSense thermostat connected to DeDietrich MCR3 (clone of Remeha Tzerra Plus).
The thermostat sends Message ID: 99 to the boiler every few seconds. The boiler always response with value 0.
Is it safe to mark Message ID:99 as unknown with serial command UI=99?
Does anyone know what is the meaning of message id 99?
I couldn't find any information about it on the internet, ot specification, otgw website.

Thanks,
Maciek

After some experiments I tried setting response to 99 Message with serial command SR=99:1
I changed the response to few values 2,3,4,5 and so on.

Different values make iSense change to some predefined programs, like time program, freeze, day, night and so on.

So I believe it is safe to use as the boiler without any other components will not want to change program on thermostat.