Thanks, I will rather try that myself, as I no longer trust the relevant technical skills of that installator (for other reasons as well), and I am not willing to spend effort in warranty applicability litigations. I would nevertheless suggest to Viessmann to consider the possibility (for example in one of the future firmware versions) to add the choice for the user to define a fixed frequency for inverter operation, though solely during "Reduced Noise" operation. Of course, making it then clear that that makes sense only when the user accepts a somewhat reduced max power capability in favour of max silent operation. Best Regards
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