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By the way, the display of the thermostat is off.
Is there an explanation for that?

The opto-coupler OK1 was broken... Now I have two voltage levels for thermostat and boiler. But still receiving only one message of the gateway: 16:48:37.019075 T80190000 Read-Data Boiler water temperature: 0.00 16:48:38.012955 T80190000 Read-Data Boiler water temperature: 0.00 16:48:39.007666 T8019...

Hi, I have some problems with my DIY gateway. When I connect the gateway to the boiler and the thermostat, the display of the thermostat stays off. Both the connectors for the boiler and the thermostat are around 13 volt. I re-checked the cables double. The gateway connected via USB gives only one t...