CPU Fan Error from BIOS - New Build

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johndoe3344

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May 21, 2008
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Hello,

New PC build here, using Hyper 212 EVO with an Intel i5 chip. It goes to the BIOS perfectly fine, but it displays "CPU Fan Error". I go into the BIOS and I leave the PC running for a few minutes (2-3 mins?). CPU Temps hover around 29 C and Fan speeds are around 550 rpm. When I look at the fan physically, it appears to be spinning continuously.

Looking at other threads at Tom's Hardware, I made sure that my EVO's fan is plugged into CPU_FAN (and not CPU_FAN_OPT). I applied heatsink using the pea in the center method. Any thoughts?

Thanks!

Edit: I let it stay on for around 10-15 minutes. Temperatures are up to about 31 C, fan speeds at low 600s.

Edit2: So it turns out that the BIOS' threshold for reporting a fan error is 600 rpm (fan speed displayed in red vs white). Thus, when I reset the PC after letting it run for 10-15 minutes, it is no longer reporting a CPU Fan error (as presumably the fan is running at >600 rpm). In this case, do I still have a problem, or is it fine to just leave it alone?
 
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C
I had the same issue. The 212 EVO just runs at a lower RPM than the motherboard expects a fan to run. I am running the ASUS Maximum Hero. I just changed the fan rpm sensitivity in the bios to give a warning at a lower RPM. My default fan warning was at 600RPMs, I changed it to give a warning at 500RPMs.
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cosmo77

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Dec 31, 2007
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I had the same issue. The 212 EVO just runs at a lower RPM than the motherboard expects a fan to run. I am running the ASUS Maximum Hero. I just changed the fan rpm sensitivity in the bios to give a warning at a lower RPM. My default fan warning was at 600RPMs, I changed it to give a warning at 500RPMs.
 
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mc962

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Jul 18, 2013
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A lot of Asus boards have that issue from posts I've read in the past, mine included. Following the above advice worked just fine. It will probably spin up above 600 rpm after a few minutes anyway, the BIOS just gets scared because the fan is a bit too lazy starting up. Mine has been at 500 rpm for nearly a year now without issue
 
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B

BogeyStudios

Commendable
Jun 18, 2016
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SOLVED this error in my case. I just built on an ASUS X99 A II using the Noctua ND-H15 CPU cooler using a single fan. Got the "CPU Fan Error" in BIOS as well. My issue was that the fan wasn't connected to the correct header on the motherboard. Initially it was connected in the upper left (CPU_OPT) header. The CPU_FAN header was right next to it. DUH! Moral of the story, check your motherboard manual and MAKE CERTAIN you have your CPU fan connected to the right header. It's pretty specific, it turns out. Otherwise the error is guaranteed.
 
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