Hi Nigel, great Job!!!!! this is very promising. I only worried with the logic of the PCB that controls the Outdoor unit, for example you can send a command to put the unit on in the heat mode but imagine you would like a temp on the HX of 55ēC maybe the unit don´t respond to its command due to the conditions ex Outside temp, or the safety features can be activated by the PCB preventing the target temp etc.....
But keep on the good work
Xotet
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