I understand. You are using the original controller.
Is the easiest way of doing, just instead of internal air heat exchanger is an water HX.
In the same way I can put the temperature sensor of the air to the floor heating, in that case I can go just with temperature lower than 30degC.
Maybe I can find a way to cheat the room thermistor input.
How many sensors has your internal board, did you connected to HX?
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