[SOLVED] CPU fan error

[alpha_2000]

So i just got a cpu fan error, but it went away quickly yet im worried should i be?
it happened when first booted into the bios, but after pressing f2 everything seemed to have been resolved, i even tried rebooting again to see if it was reoccurring which it is not, im kind worried on what the cause for this is.

 

[JohnBonhamsGhost]

include your complete system specs along with the cooler and fan(s) make/model.

 

[alpha_2000]

amd fx 6300

noctua nh-d15s

Asus M5A99FX PRO R2.0 ATX AM3+

Crucial Ballistix Sport 16 GB (2 x 8 GB) DDR3-1600 CL9 Memory

Western Digital Caviar Blue 1 TB 3.5 7200rpm

MSI GeForce GTX 1050 2 GB GAMING X Video Card

Corsair 200R ATX Mid Tower Case

EVGA GS 550 W 80+ Gold Certified Fully Modular ATX Power Supply

LG WH14NS40 Blu-Ray/DVD/CD Writer

 

[JohnBonhamsGhost]

Noctua makes pretty high quality fans so unless you've been really rough with the cable/connector i doubt their fan would just fail.
but it's always a possibility.

i would be more inclined to believe the motherboard's CPU_FAN header may have had a slight malfunction or the onboard fan controller itself.

i would reseat the fan just to make sure it is firmly connected to the motherboard.
and keep an eye on the fan and the CPU temperature for the future.

 

[Paperdoc]

Two possibilities to check.

Simplest: it is possible the only problem is a bit of oxidation / corrosion of the metal contacts where the fan plugs into the mobo header. This might create an intermittent connection of the fan speed signal line on Pin #3. With your system shut down, open the case and locate the CPU cooler fan connector / mobo header. Carefully unplug, then plug back in. Repeat several times. Check carefully that you have not disconnected anything else, then close up and run. This action can "scrub" tiny oxidation films off metal surfaces to re-establish clean contact.

It is just possible that the fan bearings are getting worn if the fan is several years old, so it is slow to start up. Normally the BIOS start-up process would feed that fan full 12 VDC power to start it for a few seconds, then slow it down to whatever a cool system needs. But if you have set that fan to a fixed lower Voltage or speed, rather than leaving it to default automatic control, it may not be getting enough power to start it.

 

[alpha_2000]

but the fan didnt fail it just showed a cpu fan error on boot, see i had hwmonitor running (i always do to keep an eye on temps) and the fan was running in hwmonitor, and i just reseated the fan, also i have heard asus motherboards have this issue is this correct?

 

[JohnBonhamsGhost]

i have heard asus motherboards have this issue is this correct?

have been through Z97, Z370, & Z590 ASUS boards and have never had an issue with fan control or CPU fan errors.
also have never run across threads anywhere stating this is common with the manufacturer.

 

[Paperdoc]

"Fan Error" normally means that the mobo header detected NO speed from its fan. The fan sends its speed signal to the mobo header on Pin #3. So no speed signal can be caused by:

1. there is no fan connected
2. the fan never started up
3. the wire for that signal is detached
4. the contacts for that pin are dirty and provide an intermittent signal
5. the fan started up slowly or AFTER the non-signal was detected.

I noted that your tale indicates the fan DID actually start up at some time, and the error message did not come back. So I focused on possible intermittent signal or slow start.

 

[alpha_2000]

"Fan Error" normally means that the mobo header detected NO speed from its fan. The fan sends its speed signal to the mobo header on Pin #3. So no speed signal can be caused by:

1. there is no fan connected
2. the fan never started up
3. the wire for that signal is detached
4. the contacts for that pin are dirty and provide an intermittent signal
5. the fan started up slowly or AFTER the non-signal was detected.

O noted that your tale indicates the fan DID actually start up at some time, and the error message did not come back. So I focused on possible intermittent signal or slow start.

i see well i removed the fan from the header and reconnected it

 

[Paperdoc]

We'll be interested to know whether the problem re-appears.

 

[alpha_2000]

also in the motherboard bios i set a warning for if the cpu fan goes under 600 rpm would this be the cause for the error? also i noticed in hwmonitor the fan speed did drop into the 500s which should i be concerned about that?

 

[Paperdoc]

The Noctua NH-D15S cooler specs say it comes with their NF-A15 PWM fan, and its MINIMUM speed is 300 rpm. So when the mobo CPU_FAN header tells it to run slowly and supply less air, it WILL run down close to 300 RPM. Yes, you SHOULD change the Low-Speed limit setting for the CPU_FAN header to something a little over 300 rpm, NOT up at 600. That is the real reason you have been getting fan failure warnings for that unit. It is NOT failing. Your BIOS has a poor limit setting you can fix.

 

[alpha_2000]

would 400 rpm work? see my motherboard only has ignore, 100, 200, 300, 400, 500, or 600 and asus support told me to put it at 600

 

[Paperdoc]

Yeah, 400 would be a good choice.