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Indeed, d.009 is not adjustable, by default D.071 was at 75 degrees, I reduced it to 60 degrees, unfortunately still not change to D.009, it still stick to 90 degrees

Hello, I have a vaillant ecotec pro boiler wired with a vaillant vrt350 thermostat (modulation enabled). When I check the ebus target temperature it is way too high, always stuck at 90 degrees. (I check using the diagnostic code D.009) I reduce the circuit temperature to 50 degrees, but...