Found a very simple solution by myself.I am wondering about a message at the start of booting about beeing in "manufactoring mode".So I pressed ALT-F (as requested) to leave manufactoring mode.From that point the fans are running at normal speed.The question still remains why and when I have entered the "manufactoring mode".
On my DELL Precision 7530 the fans are running at maximum speed.It's an model from may of 2019 with Intel XEON E-2167.Speedfan tells me that fan 1 is running with 5349 RPM and fan 2 with 5299 RPM.So I have cleared the the fan houses without success.Then I have updated all drivers and BIOS via SupportAssist tool without success.When checking the laptop via diagnosis I got these error messages:Processor fan: Errorcode 2000-0511, Validation Code 70161: "the (processor fan) fan failed to respond correctly"Video Fan: Errorcode 2000-0511, Validation Code 70161: "the (video fan) fan failed to respond correctly"my support ends in may 2022.The System BIOS has 1.21.0 and Build 4400.13.What's wrong?Thanks for your help.
DELL Precision 7530: Fans are running at maximum speed