Let me provide some assistance.
I would suggest following the guide for System fan runs too fast or too loud. Most importantly, we need to make sure that you program the fans properly when running the firmware update package for your board, particularly when updating the FRUSDR portion of the update.
What is your chassis model? And what is the BIOS version you are running with?
I downloaded and installed the latest EFI System Firmware Update Package (SFUP) which contained the System BIOS, ME Firmware, BMC Firmware and FRUSDR. After that it said fan configuration invalid and auto-detection failed. I could either select a Workstation System P4000CR family or do a manual setup. Since I have a W2600CR I chose the 2nd option, but I got all sorts of questions I could not answer so I decided to go back to the firmware upgrade and not run the Standard Update Procedure (which updates all 4) but do a Individual Firmware Update Procedure and I only did the FRUSDR update. After that the system was recognized correctly and there was only an initial full blast of the fans and then the machine became quiet as a whisper after a few seconds. What a relief! The ASC is now also able to read out a lot more sensors.
In short: problem solved, thanks for your suggestions!