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Schelte, Today i noticed the opentherm low power adapter is already in place when you buy an I series boiler from Atag. So you don't have to buy it seperately. It's not connected though. The opentherm low power adapter can be found at the back of the control board inside the boiler. Hooking up the O...

Found some specs.
Atag advises an OpenTherm Low Power Adapter to be installed between boiler and OT thermostat.
Could low power (specs OT 3.0?) influence communication between OTGW and Atag boiler?

Thanks for your reply Schelte. I used to start my OTGW first and then start the boiler. I'll give a reverse start a try. On this forum i read about the voltage regulator getting very hot (which is what i'm experiencing also; on average my OTGW with esp8266/nodemcu draws around 100 mA; my external po...

I hooked up an OTGW (with esp8266) from Nodo shop to my Atag boiler and Atag One thermostat. In gateway mode it is working as it is supposed to. However in monitor mode it stops working with lots of errors 3. Also in gateway mode after a few hours my thermostat looses connection with the boiler with...