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Cpu Fan Error!

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March 5, 2014 12:20:20 AM

Cpu Fan Error in Startup

Building a new workstation PC- relatively new to PC building, last PC I built was 6 years ago and have built a total of 6. Things have gotten a lot more intense in building PC's nowadays, but in a good way :) 

Latest PC
i7 4960x
Noctua NH-D14s with additional 140mm
p9x79 e ws
corsair 64bg
gtx 780ti
ax1200i
cooler master haf 932

its a very similar build to this
https://www.youtube.com/watch?v=PhkJLF3oyI8

Everything seems to be up and running except for the Cpu Fan error on startup

I tried updating to latest bios from asus BIOS 1501 - didn't fix it (although maybe the update didn't work you can see in the picture it shows version 2.10.1208)

I then tried to lower fan min speed to 400 -didn't fix it

tried putting the cpu fans connected to the exact cpu fan/cpu opt fan slots stated in the motherboard manual

I then tried ignoring all the monitoring options on all of the cpu fans (under the monitor tab) - which worked and I was able to install windows 7 64bit. However when I went back to enable the monitoring the same problem occured and has the startup stop on the screen below


Not sure what the issue is.

Any help would be great! Really appreciate it








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a b V Motherboard
a b à CPUs
March 5, 2014 2:13:18 AM

I checked out Noctua and they say that there may be a compatibility issue when using the ULNA.

"I get a CPU fan error despite the fan is running!
Some mainboards display a CPU fan error when the fan speed falls below a certain threshold, e.g. 900 rpm. If you want to run the fan below this speed (e.g. using the supplied U.L.N.A.), please adjust the threshold in the BIOS or disable CPU fan error warning."

and also

"The fan doesn't start with the Ultra-Low-Noise Adapter (ULNA)!
Unfortunately, many Gigabyte mainboards use a special control circuit that can lead to start-up problems in conjunction with the Ultra-Low-Noise Adapter (ULNA). This control circuit remains active even when automatic fan control is disabled in the BIOS. In these cases, please use the fan without the ULNA or connect it directly to the power supply (or an external fan controller) in order to ensure reliable operation with the ULNA."

I hope those help.

PS the cooler looks like it kicks A@#!
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March 5, 2014 2:25:27 AM

ngrego said:
I checked out Noctua and they say that there may be a compatibility issue when using the ULNA.

"I get a CPU fan error despite the fan is running!
Some mainboards display a CPU fan error when the fan speed falls below a certain threshold, e.g. 900 rpm. If you want to run the fan below this speed (e.g. using the supplied U.L.N.A.), please adjust the threshold in the BIOS or disable CPU fan error warning."

PS the cooler looks like it kicks A@#!


Thanks for the response. Yeah the cooler is a beast! So are you leaning towards disabling the cpu fan monitor? Cause when I do that it starts up perfectly fine. Then possibly get a software program to monitor cpu temp/ fan speed for safe measures?



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a b V Motherboard
a b à CPUs
March 14, 2014 1:16:32 AM

There are a few programs that can monitor fan speed, temperatures etc. out there (like Everest).
I personally don't like installing that kind of thin on my PC because they tend to be buggy and use up resources. You should be able to find one from your Mobo manufacturer that will do the job and probably be safer.

Generally speaking though with that Noctua monster installed the last thing you will need to worry about is your CPU temp!
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