vaillant modulation

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    Is there a way to check Actual Modulation Level on Vaillant EcoTEC 630 ?

    Hi, I have the ecoTEC plus 630 (VU 306/5-5 R2). I have the VR65 for DHW, but am using a NEST for UFH controls with the Boiler Flow set at 55 degrees. As flow temp increases towards 55, modulation increase (goes lower) but even when at 55 flow (d.40) for some time, the boiler is still running...
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