Google Nest Community

AndyB151 · 11-18-2023

Hi, I have a Viessmann Vitodens 100-W boiler has been working fine with Nest Learning thermostat for eighteen months using the open-therm. A few months ago I had an H73 error on the thermostat suggesting unable to detect the open-therm connection and...

AndyB151 · 11-24-2023

Hi, it hasn't repeated the fault again but last time it was a few months before it recurred.Kind RegardsAndy

AndyB151 · 11-21-2023

Hi, Thanks for the reply. I have reset the thermostat and am waiting to see if it throws up the H73 error again. Kind regards Andy

AndyB151 · 11-19-2023

Hi, thanks for the reply. I have only de-powered the mains supply to the system and have not restarted the thermostat; what would be the procedure for that?Kind RegardsAndy

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