CPU Fan error boot (Not the common one)

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sneeken

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Dec 16, 2017
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510
Hello.

Yesterday when i came home from work, i turned on my computer (Wich is 2 weeks old, prebuildt from a store). I got the CPU fan error wich is quite common. But this one is tricky... When i get into BIOS, NO fans are showing, except for AIO Pump. Weird thing is..i don't have water cooling.

I could boot if i select Ignore or the cpu fan and the mysterious AIO Pump, but temps now spike from 35-55 in a cold room, right after boot, doing simple surfing. This was not the case before, where i had from 30-45. Then i tried giving a little bit of load, while playing games, and it never went over 46 degrees.

Since this is a new computer, i dont want to have the "ignore" solution. Iv'e also tried resetting the BIOS and clearing the CMOS. Ofc iv'e tried plugging fans out, and in. Also everything is plugged in correctly. Nothing works.

Iv'e been hesitant to send it back to where i bought it, because i dont want to wait 2 weeks for it to be repaired. Do you have any solutions? Specs below.

Specs:
Ryzen 1600X
ASUS ROG B350-F
Zotac gtx 1070
Cpu cooler (This is horrible, but was in the packagedeal): Alpeföhn Sella
DDR4 2133 Vengance

Thanks for answers.
 
Solution
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If the CPU cooling fan fails to register a speed, its speed signal is not getting to the CPU_FAN header somehow. FYI, the speed signal is on Pin #3 of the header. It is a series of pulses (2 per revolution) generated in the fan and sent back to the mobo header for counting on that pin. This can happen because the connections inside the fan are faulty, or because the wiring at the fan end of the fan's cable is not making good contact, or because the connector on the cable end is making poor contact with the pins of the header, or because the mobo header itself and its counting circuits are faulty.

As a test, switch the CPU fan connector with one of your Case fans so both are still plugged in, but to the wrong headers. Now start up and...
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sneeken

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Dec 16, 2017
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Yepyep, everything is connected correctly, BIOS and every driver is up to date. I'm pretty good with computers, but this is doing my head in.. Everything worked fine until yesterday. Every fan was showing, and RPM's and temp was good.
 
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sneeken

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Dec 16, 2017
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it was actually a chassis fan who was plugged in the AIO header. It's in the right place now, so now it registers both cha_fans. But still, my CPU fan (wich is plugged in the right header, CPU_Fan ive checked this 100 times now) is still not registered. I fear it's a sensor on the motherboard. The fan is going, but the RPM shows N/A. So the problem is still there..

I also fear it could be the header on either the cpu fan or the motherboard. I have RMA, so they'll replace anything that's broken. Its so weird, just opening a new tab spikes the cpu from 30 to 55 degrees. Might be the voltage control on ryzen though..
 
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Paperdoc

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If the CPU cooling fan fails to register a speed, its speed signal is not getting to the CPU_FAN header somehow. FYI, the speed signal is on Pin #3 of the header. It is a series of pulses (2 per revolution) generated in the fan and sent back to the mobo header for counting on that pin. This can happen because the connections inside the fan are faulty, or because the wiring at the fan end of the fan's cable is not making good contact, or because the connector on the cable end is making poor contact with the pins of the header, or because the mobo header itself and its counting circuits are faulty.

As a test, switch the CPU fan connector with one of your Case fans so both are still plugged in, but to the wrong headers. Now start up and check for fan speed readings and error messages. Both fans will be running and providing cooling adequate for a short test. Now, if the CPU_FAN header still reports no fan running there, you know the problem is in the mobo header. But if this makes the CPU_FAN header happy with a speed signal, BUT the CHA_FAN header with that actual CPU fan plugged in says that its fan has no speed, then you know it's the fan somehow. Third possibility: both fan headers are happy, and this means there's an intermittent connection issue with the actual CPU fan. Shut down and re-connect the fans correctly. Now examine the CPU fan connector on the end of its cable. Look for a loose connection or maybe a poor spinginess or possible misalignment of the metal parts inside the holes of the connector. Plug it into the CPU_FAN header again, start up, and see if the problem is still there.

If the problem persists and you have isolated it to either the mobo or the fan, you have better info to provide to the supplier shop so they can fix quickly.
 
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Solution
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sneeken

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Dec 16, 2017
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Ill give this a try right away :)
 
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sneeken

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Dec 16, 2017
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Ok, so i didn't do the thing you suggested.

I didn't do it because earlier i plugged the cpu fan in the CPU_opt, and the RPM was showing. So in this case, the CPU_fan header is broken. So it's basically what you said! Thank you so much for the reply anyway. Great answer :)

I hope this thread will helps someone else!
 
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sneeken

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Dec 16, 2017
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Ok. So apparently it was a loose screw between the motherboard and the case, wich ruined the CPU fan header. My motherboard got replaced by a new one. But, i have not gotten my PC back after 2 weeks, as they sent it the wrong way...
 
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