I can feel it more on base of the unit and not the pipes.
Direct measurement with the accelerometer also shows similar, it’s a magnitude lower on the pipes after the flexis, but still transmitted through the base. My pipe arrangement is very simple though, hardly any is exposed outside.
I found I couldn’t hear anything below about 10 on the arbitrary value of magnitudes on the acceleration FFT, and problematic resonance was anything above 100.
Quite easy to track these down once you can see them on the phone, adding mass can isolate each thing one part at a time and you can quickly get a sense of what’s going on.
I don’t think it was a specific fix for me, but that option was on the table. Which is good.
It was an update around April time I think. The control method is now way more complicated, you can see it modulates better too, my emoncms shows far less rollercoaster style energy use.
Hush mode helps massively.
The “noise” is seemingly just inherent to the cosy 9 and just must be a bad combo on my particular house. The updates essentially stop the fan ever reaching the rpm where it’s problematic. But it’s still there* if that makes sense. I.e. the engineer seemed confident that a replacement fan would result in the same.
I had to reach some new level of customer service to avoid getting gaslit.
They didn’t seem that interested in the accelometer data.
Engineer didnt have any more tooling than I have, e.g. No way to actually command the fan rpm.
