My machine was making noise, the more flow (open flow control on top of the group or machine was filling the steam boiler - more noise than when brewing) the more noise. I learnt today (from the Profitec help line in Germany) that there is a metal mesh filter right behind the fitting that connects to the braided water hose.
Remove the hose from that fitting. Remove this fitting (it looks like a reducer) and behind it you find the small mesh filter. (no need to mess with the rotating 90 degree fitting!)

I suggest doing this when having a new mesh filter in hand. I tried my best with descaler and a brush, but it is very fine and 7 y old, so I am sure a new one would be better.

The machine is quieter now. If I open the flow control on the group (extra add on I added) too much, the flow to the pump is not sufficient and it gets noisier again but I do not need this kind of flow. Will source a new mesh filter though which might get rid of the problem

Those mesh filters can cause issues, and if plumbed in with a good sediment filter, shouldn't really be needed. It is available in Australia as a spare part;

https://www.jetblackespresso.com.au/sho ... c519900369

Thanks Kitt, good point, I run a proper BWT filter so probably I should remove the mesh disc. Been putting up with a noisy machine for AGES. Thanks for the link.

Great info! My machine was lough enough to wake me up when the pump started to fill the boiler in the morning. I just checked my filter and it was caked with crud (even though I have a filter/ softener setup). Removing the mesh filter made an immediate difference, I will order a replacement and install it when I receive it.

Nick is saying what I am thinking...
If it's plumbed with a good sediment filter, there never would have been an issue with the little mesh filter.