Case fans stuck at 100% after every reboot

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Skogis

PCHF Member
PCHF Member
Mar 11, 2019
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Hi!

I newly built my first PC, and everything is running as it should, except for the case fans.

The problem i that every time i reboot the computer the case fans gets stuck on high speeds and wont slow down no matter hon long i leave it to idle. However, if i put the computer in to standby mode and the start it agian, the fans work as they should.

System specs:
Gigabyte z370 hd3 (rev 1.0)
i3 8100
8gb corsair vengeance ddr4 2666mhz
The case fans i use are 3 pin fans from phanteks (included in p400s). They're hooked up to the mobo and controlled by smart fan 5 in m.i.t
I have set them to voltage control, and they both have system 1 as temperature input.

Does anyone have any idea of why they are acting in this way?
 

Bruce

Forum Regular
Support Team
PCHF Member
Oct 8, 2017
713
153
27
Yeppoon, QLD, Australia.
so they are 3pin fans connected to 4pin headers?
any chance they are not on the correct 3pins? (unlikely - just throwing it out there)

is the BIOS the latest version?

have you tried changing the fan system in MIT to silent or manual?
 

Skogis

PCHF Member
PCHF Member
Mar 11, 2019
4
0
16
so they are 3pin fans connected to 4pin headers?
any chance they are not on the correct 3pins? (unlikely - just throwing it out there)

is the BIOS the latest version?

have you tried changing the fan system in MIT to silent or manual?
They are connected to the 3 pins that they need to be. The BIOS is perhaps not the latest version, but should i take the risk and update it?

One of the fans i put to silent and the other one to normal. The problem is that after a reboot they dont seem to be controlled by smart fan 5 at all since they all spin at max speed.
 

Bruce

Forum Regular
Support Team
PCHF Member
Oct 8, 2017
713
153
27
Yeppoon, QLD, Australia.
I've updated the BIOS firmware over my time maybe around the 50 times mark, and not once has it ever gone pear-shaped.
you just need to make sure you are getting the right update for you mobo make/model, don't try the beta versions and make sure you don't lose power during the process.
and if offered, make a BIOS backup.
 

Skogis

PCHF Member
PCHF Member
Mar 11, 2019
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16
Okay, thanks. Have you solved similar problems while updating you bios?
 
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