How to Fix a CPU Fan Speed Error Detected Message On Boot When Fan is Working

Getting a CPU Fan Speed Error when booting your PC on an ASUS motherboard? If you know your cooling solution is working then this is probably what you need to do. Often this can happen when using an AIO system. Repeat, Be sure your CPU cooling solution is working before doing this since we are going to be telling the system to not monitor the fan speed. We are using an ASUS ROG motherboard to show how.

Important: Be sure your cooling solution is working before doing this. We will be telling the system to ignore the fan speed. And please subscribe to help support our channel.

Step 1: Enter the BIOS screen by clicking the F1, F2, F12, or Del buttons after rebooting your computer.
Step 2: If in easy mode change over to advanced mode to change the settings
Step 3: Enter the MONITOR section of the BIOS settings.
Step 4: Find the Fan Speed Monitor section and in there should be the CPU Fan Speed option.
Step 5: Change the setting to ignore and save

Depending on the BIOS version these steps may be slightly different.

At this point, it should no longer give the warning. But be aware that this should only be done if you know the cooling solution is working and you are monitoring temps.

[MrNerfgun]

Just had this problem and found a simple fix that other people might not be looking out for. I have an rog strix b550f and a installed an AIO, I noticed that I plugged the pump into the fan plug because they’re right next to each other the writing is only on the one side so I thought it was either or. Obviously not the right way but I like building computers and solving problems as I go so it didn’t seem out of the ordinary. Just a reminder to check simple things like this so we don’t come to the comments of videos and freak out 😅

[paulphillips]

Thank you much for this video. OMG, just built an i9-12, 900K on an asus z790-H with the cpu fan error causing my pc to not boot directly to windows. This fixed it in 60 seconds. Can't thank you enough. Cheers!

[Auroz]

Is there any way to fix this issue physically? I have a very unstable PC that needs me to reset CMOS or update BIOS very often for investigation, I would love to know how to avoid getting this small but annoying notification every time. My AiO is working just fine, and plugging a fan in the CPU_FAN doesn’t seem to change anything (the fan won’t spin).

[Cybotech]

I did the same, but I have to do this every time when I turn on my pc. what's the permanent solution?

[thraxlebuffle]

So with this fix I can plug the pump to the AIO_PUMP connection as indicated in the installation guide ? (ASUS z790 mobo)

[testecanal-enfq]

Concise, yet complete, didn't need to watch the full video to get what needed to be done.

[TunerWorldLLC]

Pump everything works but doesn't recognize I get this error. I've done this b4 and reset still didn't work my pc shuts off after 3 seconds if I don't race to bios. Anyone else figure anything out?

[Wwmw]

This worked! Thanks bro, I was messing around in my bios and re-enabled that CPU monitor and completely forgot how to disable it lol

[TaskForce--]

Bro thank you so much I have been stuck for ages not knowing the problem I just installed a new AIO and it works perfect but I couldn’t boot because of cpu fan speed

[ForceFedg]

Words cannot express how much this video helped me. It may not seem like it but this was a huge help. Thank you!

[garbhanmyles]

Ah you fabulous humanoid . Life saver! Thanks a million. 🙏🙏

[andreasstahl]

I had this problem with my new build, and my aio fans. I rebooted my system and I got straight into BIOs, and restarted again after I set my boot driver, and I got into OS.

I'm just very confused because my fans lit up with RGB but the fans don't spin on start-up. Might this be because of thresholds or does the fans usually start to spin at start-up?

Anyone that knows how I can control the speed of the fans even if they are not spinning on start-up just to check that they are actually functioning?

Would be much apprecaited!

[ifoundmemallet]

For some reason even on auto detect my CPU OPT FAN runs at 2500 RPM lmao and i’m not sure why. My PC doesn’t even get that hot. My PC also just RECENTLY ran into this problem. Something about the detection error? Seems stupid tbh but anyways this didn’t seem to fix anything seeing as how it won’t let me exit the BIOS screen

[jamesgue]

Hey ty for that I was getting mad. I have custom cooling for the cpu and video and nvr had this come up the 2. 5 years I've had this system thanks again

[BigBroskibro]

You a G my dude . Hope your Chanel grows exponentially

[ryangonzales]

Thanks man. Sometimes motherboards get weird by itself.

[dogearooski]

Thanks this helped me after updating my bios.

[Danielbrown-zvck]

I watched another guide and thought all was good with my bios update but then I got this issue. Panicked. Found your video. Followed it and bam....back in and happy. Thank you so much

[OzenFn]

This still works and save me thanks a lot bro

[novakmilic]

Everytime i click save changes my pc restarts and open bios again, and it just goes like that. I cant use my pc. Does anyone knows the solution?