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Unfortunately i did not get the chance to try out the FTDI connection again, but it seems to be more of an issue of communication between the Nest and the OTGW. I have no idea if it is due to a Nest update or if something happened to the OTGW after the reset a few months ago. Is there any way to che...

Hello, i tried again connecting the OTGW with the Nest, but am constantly getting the H73 error message (no compatible Opentherm device found). I have already tried resetting the heatlink, setting OTGW from gateway to monitor, setting power supply from 24V to 20V and also changing the voltage in OTG...

Wow...thank you very much for the detailed explanation! It shows how much work and know-how you have invested in designing the gateway. I was a bit worried to connect the gateway again to the boiler, but after reading this am going to do this without worries. I will make sure to log everything next ...

Thank you for the quick reply and explanation. I really appreciate your work and was very glad i found the OTGW, as it was very easy to implement with my limited knowledge in electronics. Regarding the issue, i have reset the Nest Heatlink and that seems to be running, but i did not manage to reconn...

Hello guys, i have bought an Opentherm Gateway from Nodo-Shop to connect to my Viessmann Vitodens 111-W. My boiler was running before that with a Google Nest 3rd Gen. thermostat without any problems. Two days ago i have connected the OTGW between the boiler and the Heatlink of the thermostat and tri...