CPU Fan Shutting Down For No Reason

[Joshywild]

So somtimes my cpu cooler will just shut off and not turn back on again(usualy after long sessions of use but i have noted it happen in shorter sessions also) despite cpu temps being more than high enough to justify the fan turning back on. I have set the cpu fan to the "Aggressive" preset in my BIOS hoping it would stay on for longer but it still seems to just shut off somtimes and i can only fix it with a restart. Its very tedious to do this everytime it happens for obvious reasons. Any suggestions?

 

[the nerd 389]

What cooler, what fan, and what components do you have? Also, how old was the computer when this started?

 

[Joshywild]

What cooler, what fan, and what components do you have? Also, how old was the computer when this started?

The cooler is the Noctua NH-D15 with the NF-A15 140mm fans. Hardware as follows -
- AMD - FX-8350 4.0GHz 8-Core Processor
- Noctua - NH-D15 82.5 CFM CPU Cooler
- Biostar - TA970 ATX AM3+ Motherboard
- Kingston - HyperX Fury Blue 8GB, 8GB corsair value RAM
- Seagate - 1TB 3.5" 7200RPM Hybrid Internal Hard Drive
- EVGA GeForce GTX 960 Superclocked Gaming ACX 2.0 2GB
- Corsair - CX 600W 80+ Bronze Certified Semi-Modular ATX Power Supply

I believe its been doing it since i had the computer but its less noticable now because the fan is so quiet so im unaware when it turns off

 

[the nerd 389]

I've had poor experiences with Biostar. They tend to use bargain-basement parts for their motherboards. Considering it's happened with multiple coolers (from the sound of it), it has to be the motherboard.

 

[Paperdoc]

Two thought to check out.
1. What is the condition of the fan? If its bearings are stiff, it may stall when a new fan would not, and then it would be very difficult to start. It would, however, start on a reboot because the normal start-up process feeds the fan full voltage to be SURE it starts up.
2. In BIOS Setup for configuring that fan, is there a way to adjust the minimum signal sent to the fan for low temperatures? If so, try setting that higher to prevent ever sending it a too-slow signal that might allow it to stall.

 

[the nerd 389]

Two thought to check out.
1. What is the condition of the fan? If its bearings are stiff, it may stall when a new fan would not, and then it would be very difficult to start. It would, however, start on a reboot because the normal start-up process feeds the fan full voltage to be SURE it starts up.
2. In BIOS Setup for configuring that fan, is there a way to adjust the minimum signal sent to the fan for low temperatures? If so, try setting that higher to prevent ever sending it a too-slow signal that might allow it to stall.

It's happened with the NH-D15, as well as another cooler (based on my interpretation of what's been said). The NH-D15 uses fans that only turn off if:
A) You're running them in DC Control and set the speed too low (You'd have to manually set that up on most CPU_FAN headers.), or
B) You're giving it EXACTLY 0% PWM signal. Any PWM signal other than 0% and the fan will spin at the lowest stable speed, as per the spec sheets for Noctua fans. I've confirmed this is the case with the iPPC series. I have not checked the fans that ship with that cooler, though.

 

[Joshywild]

Two thought to check out.
1. What is the condition of the fan? If its bearings are stiff, it may stall when a new fan would not, and then it would be very difficult to start. It would, however, start on a reboot because the normal start-up process feeds the fan full voltage to be SURE it starts up.
2. In BIOS Setup for configuring that fan, is there a way to adjust the minimum signal sent to the fan for low temperatures? If so, try setting that higher to prevent ever sending it a too-slow signal that might allow it to stall.

the fan is in great condition, no damage or anything like that and the bearings are fine. there are settings in the BIOS for the fan but im not sure if theres one for what your describing

 

[Joshywild]

I've had poor experiences with Biostar. They tend to use bargain-basement parts for their motherboards. Considering it's happened with multiple coolers (from the sound of it), it has to be the motherboard.

i think it is the motherboard as ive had other problems with the computer that ive been informed are most likely motherboard based, cheers