Cpu F1 fan Error only on first boot

mr griffin · 16 Feb 2022 at 07:41

Hi I recently built a pc for one of my mates, it has a strange issue that I can't figure out.
First boot in the mornings it always comes up with a F1 cpu fan error??
After that it seems to be OK but will randomly do it other times too but always in the morning. Can't understand why.
Does anyone have any idea why this is happening?
Specs below

Asus x570 Crosshair v11 hero wifi
5900x
64gb corsair 3600 ram
1000w bequiet psu
2 x 2tb segate firecuda 530s
Bequiet dark rock pro

mikedigitales · 16 Feb 2022 at 08:41

Is there a minimum or a warning speed set for the CPU fan in the bios?

mr griffin · 16 Feb 2022 at 09:45

mikedigitales said:
Is there a minimum or a warning speed set for the CPU fan in the bios?

Yes you can disable f1 error and put it to ignore, but it shouldn't be doing it, it always does it first boot up of the day and then it's pretty much OK so makes no sense

BUDFORCE · 16 Feb 2022 at 14:33

Assuming the fan is actually working as intended?

Journey · 16 Feb 2022 at 14:37

mr griffin said:
Does anyone have any idea why this is happening?

Is there a fan plugged in to the actual CPU fan header, and if so is it spinning up when the system first powers up?

mr griffin · 16 Feb 2022 at 15:02

Journey said:
Is there a fan plugged in to the actual CPU fan header, and if so is it spinning up when the system first powers up?

Yeah I had the Splitter on the Dark rock pro 4 plugged into the cpu fan header, and now have also taken the Splitter off and plugged one into the cpu fan header and the other into the second cpu fan header, so both are being used, both fans are also spinning. That's why I just can't understand why I would get the fan error on this machine every morning.

mr griffin · 16 Feb 2022 at 15:03

BUDFORCE said:
Assuming the fan is actually working as intended?

Yes it's spinning up fan, it's pwm and you can see it going faster and slower as the cpu is stressed on something like cinebench

BUDFORCE · 16 Feb 2022 at 16:53

mr griffin said:
Yes it's spinning up fan, it's pwm and you can see it going faster and slower as the cpu is stressed on something like cinebench

I'd just turn the warning off if you can then.

It's probably not worth the hassle trying to diagnose.

Armadillo · 16 Feb 2022 at 20:07

Can't really help, but I had the same issue on my x99 board (Gigabyte). It only started after a bios update, earlier bios never did it.

First boot if it had been off at the mains, would give the cpu fan fail beep. It was working fine, I just assumed the slow spin up of the fan was below whatever it considered "minimum".
Never solved it, never worked out why it was only after being off at the mains, I just turned the alarm off

.

SpellowHouse · 18 Feb 2022 at 07:42

Perhaps the fan has failed? Four pin fans run at a commanded % speed and they also report that speed to the BIOS. If the reporting has failed, the fan will work absolutely correctly apart from the fact that you will get an error from the BIOS. I know Asus and they just report the error once, when the machine boots up, they do not report it again when the PC is running. It could be the fan is not reporting the speed right at that moment when the PC boots. I would try replacing the fan or you could just not care and disable the warning in the BIOS. You can set a separate temperature warning in the BIOS that will do the same thing and cover you should the fan actually fail.