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CPU Fan Error help +RepPosted:

Eazy
  • Winter 2017
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Everything's plugged in as normal , just changed my motherboard over, but getting a message when booting bios that CPU FAN error ? why it's saying that ?

Motherboard is ROG STRIX B350F GAMING

+Rep for help

Also it's on 35*c currently as can see in photos.



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#2. Posted:
TaigaAisaka
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Few things you can do.

Go to Advanced Tab, there should be a section that is for fan speeds, monitoring of the fans and profiles labeled as Silent, Medium, High. Scrolling further down you will see a low RPM monitor. This is the signal when trying to post, if your fan RPM is lower than the selected RPM, it will give you the error. Change this to 600 RPM or maybe 500 RPM if you can. This will be the lowest settings, meaning unless something is going wrong with your AIO, you will bypass the screen since your RPM is already at 1100.

Second option is to plug in one of the radiator fans into the CPU_FAN header. Cable management might suffer slightly, but most of the time this is the fastest fix without tinkering in BIOS.

Third option, just disable the fan error monitoring. This is what I did on my ASUS V Rampage because the above 2 options didn't work for whatever reason; then again, that motherboard was gimmicky anyways. Disabling the fan error monitoring will never alert you if say your AIO isn't working, but at that point, that's something you should be able to notice on your own. It's more so that you don't power on a system, play, put stress on a CPU when nothing is cooling it, but again, this is something that you should notice if anything were to go wrong with your AIO. I believe to find this option is Monitor > Fan Speed Monitor and change the option to ignore.
#3. Posted:
Eazy
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Sorry is this what I'm changing only thing I can find [ Register or Signin to view external links. ]
#4. Posted:
TaigaAisaka
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Eazy wroteSorry is this what I'm changing only thing I can find [ Register or Signin to view external links. ]


Yeah, that's the option. If it detects your RPM is lower than 500, it will give you the error you've been seeing. If you still get the error after changing, plug in one of your radiator fans into the CPU_FAN header. Motherboard might just be getting "confused" and thinking the RPM is 0, because your CPU doesn't have a fan connected. My Gigabyte motherboard didn't have this problem with an AIO, however like I said, my ASUS V Rampage did. If the second option doesn't fix anything, just turn the monitoring off and you should never see that error again.

Edit: You can put it lower than 500 if you want and if it allows it. 200 would be fine lol, I just didn't remember the limit ASUS allows you to put on it.
#5. Posted:
Eazy
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I just plugged top fam from rad into the second cpu fan slot and still error message , is it defiantly okay haha ? It's about 35/36 without me using it? And shall i plug fan back into normal slots or keep it in cpu second slot
#6. Posted:
Eazy
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Also now it says CPU fan n/a , and CPU optional fan is 2745 rpm ha is that better then the 1300 odd I was getting
#7. Posted:
TaigaAisaka
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Eazy wroteI just plugged top fam from rad into the second cpu fan slot and still error message , is it defiantly okay haha ? It's about 35/36 without me using it? And shall i plug fan back into normal slots or keep it in cpu second slot


Your AIO is fine, as it's running and keeping your CPU cool. Problem is the motherboard is thinking there is nothing cooling it. You can plug whichever fan back into the header you had it at originally. This time go into BIOS and try the third option. Ignore the error in general where it won't display it. IF that still doesn't work. I'll drive down to storage, go find my V Rampage motherboard, boot it up, connect an AIO and give you the exact settings I have in the BIOS and where I have the fan headers at.
#8. Posted:
Eazy
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TaigaAisaka wrote
Eazy wroteI just plugged top fam from rad into the second cpu fan slot and still error message , is it defiantly okay haha ? It's about 35/36 without me using it? And shall i plug fan back into normal slots or keep it in cpu second slot


Your AIO is fine, as it's running and keeping your CPU cool. Problem is the motherboard is thinking there is nothing cooling it. You can plug whichever fan back into the header you had it at originally. This time go into BIOS and try the third option. Ignore the error in general where it won't display it. IF that still doesn't work. I'll drive down to storage, go find my V Rampage motherboard, boot it up, connect an AIO and give you the exact settings I have in the BIOS and where I have the fan headers at.
I appreciate your help very much thank you!

Last thing before I attempt all this haha is that the RMP Is now 2700 , before it was 1300 what's better haha
#9. Posted:
TaigaAisaka
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Eazy wrote
TaigaAisaka wrote
Eazy wroteI just plugged top fam from rad into the second cpu fan slot and still error message , is it defiantly okay haha ? It's about 35/36 without me using it? And shall i plug fan back into normal slots or keep it in cpu second slot


Your AIO is fine, as it's running and keeping your CPU cool. Problem is the motherboard is thinking there is nothing cooling it. You can plug whichever fan back into the header you had it at originally. This time go into BIOS and try the third option. Ignore the error in general where it won't display it. IF that still doesn't work. I'll drive down to storage, go find my V Rampage motherboard, boot it up, connect an AIO and give you the exact settings I have in the BIOS and where I have the fan headers at.
I appreciate your help very much thank you!

Last thing before I attempt all this haha is that the RMP Is now 2700 , before it was 1300 what's better haha


Like it says CPU Fan Speed as 2700 RPM? The term "better" is subjective. 2700 RPM is louder because fan speeds are at a higher speed and/or liquid is moving at a faster speed. Since it was plugged into a CPU_FAN header, you'll just have to adjust the AIO curve once you get into your desktop. Make sure it's even at 2700 RPM. If there's no rattling going on from your AIO, then I question if it's even hitting 1400 RPM.

Edit: Looking at other sites for the specific AIO; apparently by this comment, the manual states you need to have the CPU Fan Header speed to 100%. I guess this is a 4th option if putting the ignore option for the error doesn't work. I would also take another look at your manual justttttttttt in case you missed something lol

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