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Thanks for your help.

If I receive more information from the manufacturer about the protocol or settings I will update here.
Hopefully I can find a way to control/integrate my boiler in my openHAB-system.

Kind regards, Hans

Hey, Indeed, looks like too much current... but why? I did some measurements while the thermostat is connected to the boiler. The default is 15V and every 25ms there are some pulses (length 2.5ms or 7.5ms) dropping to around 10V. And around every second there is a long pulse-train passing the line. ...

Hello, Thanks for the reply. My thermostat is a Bosch CW400. With a quick search on internet, I can't find if this one is working with opentherm. But I see the connection is working from OTGW to this thermostat. In the OT-logger I see the message "Thermostat connected" and some regular mes...

Hi all, I just purchased the OTGW interface from nodo-shop.nl (smd version) and connected it to my new boiler Bosch GC9000iWM. The region on the PCB with the diodes is quickly heating up, you can easely burn your fingers. So I disconnected the board to prevent damaging the board. After inspection Q1...