Hi everyone. 

I updated windows last night to version 2004 from 1909. Everything went well and was working great. 

This morning, I restarted the PC and got this hardware scan diagnostics screen during boot up and my case fans are running at Maximum speed. The diagnostic reported that the CPU fan is not responding and I should contact dell support. Error code 2000-0511. Well, there is no CPU fan connected to the header on the mobo because the thing is liquid cooled by Dell and the case fans are plugged into the right headers for CPU pump, front fan and top fan (which blows on the radiator and cools the CPU). 

I just spent 3 hours with Dell support and am waiting for a call back in the next 48 hours. Meanwhile, the system is running great but the fans are on full blast and I feel like the rocket is going to take off.

After tons of trouble shooting, a bios upgrade, and stress testing, it appears the CPU And GPU are functioning properly and their temperature sensors are just fine. What's not fine is the set of sensors called "Dell EC: Alienware Aurora R8". This sensor reports that my CPU is at 191 degrees C and that my fans are at 0 RPM... I see this information in hwinfo64 and on the alienware command center application. screenshots below. 

This shows actual temperatures given the sensor information on the CPU and GPU.

This is under the thermal profiles in the command center application. Clearly wrong.

Here is the HWinfo screenshot where I identified the name of the sensor to be "Dell EC: alienware aurora R8"

 

I am about to roll back the windows update. But it would be a huge surprise if that's what caused the issue since it was fine last night and the fans go crazy way before windows starts... 

Has anyone had issues with this before? What was the resolution for you? Suggestion from support so far is to send in the entire PC which I absolutely can't do given I spend at least 8 hours working on it daily... 

Any advice would be highly appriciated.