Wiring for Vaillant 938 NEST install

The heatlink connects upto 230V L/N/E, however which should the 2 call for heat wires go? Is it the 24V RT or the 230V RT?

 

You can use either, but not both, and if you end up with 230V on the 24V connectors, the PCB will be destroyed.

 

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