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Asus Sabertooth Z87 "CPU Fan Error"

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October 3, 2013 2:49:13 PM

Hello there community, once again.

So, I've just finished building my gaming/video editing PC and it looks fantastic!
Now, to the problem itself, when I boot the computer everything works great, the motherboard has a green light and all (but there's a red one on the right, don't know if it's supposed to). When I get to POST, it says "CPU Fan Error", "Press F1 to Setup". My CPU Cooler is the Be Quiet! Dark Rock 2 (cooling an i7 4770K), everything is connected on the right place, the fan attached to the cooler is spinning fine, my CPU average temperature is around 30-32 degrees (which I think it's normal, motherboard is at 27 degrees average). My average RPM for the CPU Cooler is around 380-400. It doesn't let me get past POST, nor it lets me install Windows.

Can someone help me out, please?
October 3, 2013 3:09:34 PM

This was my exact problem also. For me I went into Bios and changed CPU fan speed from 600 to 400 and be sure to save and exit. This worked for me.
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October 3, 2013 3:18:56 PM

dhale said:
This was my exact problem also. For me I went into Bios and changed CPU fan speed from 600 to 400 and be sure to save and exit. This worked for me.


Yeah, I tried that already but it keeps telling me "CPU Fan Error". I don't know what else to do, I know that everything is connected on the right place, all the fans are spinning.
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October 3, 2013 3:21:37 PM

edit: wrongthread lol
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Best solution

October 3, 2013 3:24:52 PM

So you did reduce the cpu fan from 600 minimum to 400 minimum correct and did you try 200 or even 0 to see if it would boot? Since you know the CPU is spinning try this and see what happens. I also assume you are on air and not water-cooled. I just built the ASUS Maximus VI Formula last month and the ASUS ROG website recommended this and it did work.
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October 4, 2013 1:01:29 AM

dhale said:
So you did reduce the cpu fan from 600 minimum to 400 minimum correct and did you try 200 or even 0 to see if it would boot? Since you know the CPU is spinning try this and see what happens. I also assume you are on air and not water-cooled. I just built the ASUS Maximus VI Formula last month and the ASUS ROG website recommended this and it did work.


Thank you very much! I just had to try again and lower the cpu fan RPM from 600 to 300RPM, there's no error now! And my CPU is still at 27 degrees by the way.
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October 4, 2013 1:09:10 AM

If this keeps happening with min. set to 600, just set the CPU fan speed monitoring to "ignore" and mobo will not check the fan speed while booting which will prevent the CPU fan error.

I have Gryphon and Dark Rock Pro 2. When I set the min. to 600, CPU fan speed is at ~580rpm which sometimes caused the fan error to come up.
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October 11, 2013 8:27:39 AM

I just had the same problem and fixed it! I whent into the bios and set the OS not to moniittor the unused CPU fan (set to ignore) the I lowered the fan speed treshold and I moved up the sliders on the fan spin up speeds and now I get no CPU fan errors.
Johnrocha said:
dhale said:
This was my exact problem also. For me I went into Bios and changed CPU fan speed from 600 to 400 and be sure to save and exit. This worked for me.


Yeah, I tried that already but it keeps telling me "CPU Fan Error". I don't know what else to do, I know that everything is connected on the right place, all the fans are spinning.


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October 12, 2013 1:11:25 PM

This is similar to what I'm having issues with and started another thread by accident, but I don't understand why I would need to lower the fan speed to start up without error. Can anyone explain, please?
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October 13, 2013 7:03:13 AM

Berdhouse said:
This is similar to what I'm having issues with and started another thread by accident, but I don't understand why I would need to lower the fan speed to start up without error. Can anyone explain, please?


I am no expert. A manufacturer probably just sets an arbitrary reporting speed. Like anything else such as a carbon monoxide alarm - it needs to have some figure set to adjust the sensitivity up or down or to report or set off an alarm. If they set nothing and you hooked it up wrong then you would have try to figure out why your CPU is too hot and throttling back. A too low a figure may be too low for your CPU and fry the CPU. Then you might ask why didn't the mobo tell me my fan was too low? If they set the reporting speed too high, then you could send too much current thru the circuit causing noisy extremely fast speeds or premature burnout of your CPU fan. Therefore, I believe some current needs to go thru for a speed report so that you do indeed see the fan moving requiring you to set the reporting speed up or down as you may need. So an arbitrary 600 RPM is set. I'm glad they do have a set figure so that I can develop a relational RPM reporting figure that I can note and see so that I can develop a sense of how to use this for more or less of a sensitivity.
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October 15, 2013 8:37:00 AM

Berdhouse said:
... I don't understand why I would need to lower the fan speed to start up without error. Can anyone explain, please?


You aren't lowering the fan speed; you're setting the fan speed below which the board panics, thinking the fan has died and your nice CPU is about to start to sizzle and puff out its magic smoke!
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March 12, 2014 8:03:10 AM

I have started up my pc for the first time and got this CPU error message, it is at around 390rpm. Answers seem to suggest I can alter a lower limit, but I can not find this in the bios Can someone explain where these setting can be found. Thanks. My board is an Asus Gryphon.
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March 12, 2014 3:16:30 PM

Assuming the BIOS is similar to the Sabertooth, it should be under advanced settings-> monitor-> and then Q-fan control->cpu fan minimum speed

Set it to whatever you want, probably something below what you are getting (500 RPM worked for me, for you it might be 300 RPM or something). After that I would monitor the temp. in BIOS for a bit maybe to make sure it's all working fine (temperature-wise), and then feel free to boot up into the OS
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March 12, 2014 4:16:35 PM

Thanks, I just had to scroll down to find find it.
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May 9, 2014 3:37:26 AM

René
Had the same problem at the first startup. Also Be Quiet Dark Rock 2. In BIOS you can alter many parameters per fan. Set the CPU-fan to "Turbo". I did for all connected fans. Problem solved. I imagin that energy-saving is just a liitle bit to rigorous. Succes.
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