CPU fan error, fan behaving strangely..

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saurabhmsingh

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Oct 9, 2017
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hi..

so day before yesterday, after having run my computer for over 3-4 hours when I restarted it there was this massage; CPU fan error press f1 to continue.. I did it and windows booted successfully, next thing I did was look into the computer case to see what's going on.. and my CPU fan was running like this..

https://www.youtube.com/watch?v=PNmLAEDkoB8

CPU temperature was 83°c, I shut down the computer immediately to avoid any kind of damage, disconnected the CPU fan then plugged it back hoping that will fix the problem, but no.. after running normally for a while it starts doing the same.. later i disconnected everything except for the CPU and the fan itself and started the computer, the same thing happens again.. does any one has an idea what's wrong with my computer?
thank you..

CPU: AMD athlon x2 250
mobo: Asus M5A78L-M LX V2 

 
Solution
madmatt30
To me it looks simply like the motor on the fan is failing.

Try plugging it into a case fan header instead.

If you get the same issue it isnt the board , its the fan
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saurabhmsingh

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Oct 9, 2017
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Sorry but I have read that already.. As well as many other questions asked by many other people, my problem seems to be different as the fan is still moving, just not in the right manner.
 
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Paperdoc

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It is still possible that you have set the minimum fan speed too low. If you do that and it slows down so much that it stalls, the system automatically will detect that and do two things. It will send out the failure alarm, and it will try to re-start the fan by sending it a higher signal. When that works and the fan starts up, the system returns to "normal" function. But that function allows the fan to slow down again to the same minimum speed, and it can stall again. Repeat. And repeat. etc.

Try setting your fan's minimum speed a bit higher.
 
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saurabhmsingh

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Oct 9, 2017
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@Paperdoc just checked, the lower limit is set to 200rpm which is also the default setting for this mobo, my PC has been running on the same setting for last 8 years but I never had this problem, still Im going to change it to a higher value now and will inform if there is any difference.. My only concern is it shouldn't be a motherboard problem as I was going to upgrade my processor to an fx6300.
Thank you.
 
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saurabhmsingh

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Oct 9, 2017
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I experimented with setting the speed at higher values but, nop.. It's still the same. just want share one observation when I first start the PC after a longer time it runs well for about an hour or so without any problem and then this starts, and keep on happening every time I start the PC, I leave it for a few hours an then try it run smoothly for some time and then back to square one.. Could this be any how be related to temperature or something that's affected by time?
 
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Paperdoc

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I agree with madmatt30. Your system is 8 years old, and what you describe sounds a lot like the fan's bearings are wearing out and nearly finished. Thus, the bearing friction is higher and this makes the fan run slower that it should for any given control setting. So, when your mobo sends the fan signal to run at 200 rpm (it thinks), the fan actually runs slower and stalls until the system discovers this and re-starts the fan. You should understand that, although the BIOS configuration screens let you set a minimum speed on units of rpm, they do NOT monitor the actual speed and make sure it does that. Instead the BIOS calculates what signal should be able to run that fan at 200 rpm and sends that out. I bet that, over the last few years, the fan's real minimum speed has been decreasing slightly, but it never stalled before so you never noticed, and the BIOS did NOT detect that because it never looks at real speed. Although the BIOS screens CAN display the speed for you, its software does not monitor that reading to be sure it is correct. It only monitors that signal to detect complete FAILURE, which is what it is detecting now.

Raising the fan's minimum speed setting high enough will force it to run fast enough not to stall for the near future. Plugging it into the PSU so that it runs at full speed all the time also will work for the short term. But the real solution will be to replace the fan.
 
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saurabhmsingh

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Oct 9, 2017
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Ok.. So here is what I did;
I started the computer, the fan ran smoothly as usual.. I put it in the case fan header it runs well in here as well, then I plugged it back in the CPU fan header and waited for the problem to begin, after running for a few hours the fan started to stutter.. And this is the opportunity I was waiting for, I immediately connected it to the case fan header and it was still stuttering which I guess as you said is a sign of a bad fan and not the board which is such a relief..

Thank you very much to you and all the other people for helping me..
 
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