Hello Daan,
just went through the log ( you should use code fences when posting logs) I saw nothing special.
My impression is, that e.g. “fanSpeed” is not yet supported by the binding. As heatings do differ so much they provide different topics in the interface. And @Markinus obviously can not install all of them at home, so chances are that this might be the case here. I own a Junkers Hybrid model with gas heater and heat pump and the interface provides no information on the heat pump part at all - no way to add them,
Same was true for e.g. holiday modes, those have been added on request. Maybe he can enhance the binding a bit to support the values you are missing. Or you add the required changes in the git and provide him a pull-request.
Sorry I’m of no help here - this just seems to be implementation related.