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Thank you for your quick answer. (and for creating this incredible piece of hard- and software :) ) By 'throwing an error' I mean it's giving 'Error 03' over the serial port. I've also connect a led to LED A and appointed function E (Transmission error has been detected) to it, when I short-circuit ...

I'm working on a heating system at our scouts club house. We just replaced our two old on/off Nefit boilers with new Remeha Calenta's (28solo). (http://www.scouting-bvh.nl/furnacecpu) My old system used a relay to switch a boiler on/off, the new boilers use the OpenTherm protocol for which I have bo...