CPU fan issue weird

Discussion in 'Overclocking & Cooling' started by ng4ever, Jan 12, 2019 at 10:46 AM.

  1. ng4ever

    ng4ever Flaccid 4Evar

    Messages:
    988
    Joined:
    Feb 18, 2016
    What would cause a CPU fan to stop working or spinning sometimes only?
     
  2. auntjemima

    auntjemima Hand Jobs Legend

    Messages:
    4,124
    Joined:
    Mar 1, 2014
    Broken wire. Poor connection. Fan issue. Port issue.

    So, I would try a different spot on the main board, one of the numerous fan connector locations. Just make sure you plug something into the cpu fan connector as well, like a random system fan, so the system doesn't think the fan isn't plugged in.
     
    Ryom likes this.
  3. jmilcher

    jmilcher 2[H]4U

    Messages:
    3,915
    Joined:
    Feb 3, 2008
    If it’s a cpu fan and you have speedstep enabled or some other bios option, sometimes at idle a fan can stop
     
    Ryom likes this.
  4. hititnquitit

    hititnquitit Limp Gawd

    Messages:
    319
    Joined:
    Apr 16, 2018
    if its a pwm fan a bios setting may be jacked up.
     
  5. Brian_B

    Brian_B [H]ard|Gawd

    Messages:
    1,898
    Joined:
    Mar 23, 2012
    Lots of reasons.

    Usually - it's a speed control setting that's dropping too low for the motor to pick up - motors usually have a low speed % threshold that they can't run underneath, or they stall or do things like what you are seeing. Try adjusting the minimum fan speed up if possible, or disable the auto-speed control and run it manual speed.

    It may also be your energy savings settings kicking in - jmilcher is correct, if temp is low enough some systems will shut off fans entirely.

    Or it's a failing motor/bearing and the fan needs to be replaced ASAP. That would also cause this.
     
  6. Supercharged_Z06

    Supercharged_Z06 2[H]4U

    Messages:
    2,360
    Joined:
    Nov 13, 2006
    Your system begging you to watercool it? :D
     
    Last edited: Jan 14, 2019 at 1:25 PM
  7. Captindecisive

    Captindecisive n00bie

    Messages:
    51
    Joined:
    Apr 13, 2017
    Depending on the cooler, it could have a 0rpm function at low temps. I had an Arctic cooler on an FM2+ APU some time ago that would stay at fan off until temps got to about 42c, then it would start spinning. A BIOS fan profile change could make it spin up, but it worked well how it was setup.

    As was stated though, it could be settings, a bad wire, or just a bad fan if you're not used to it shutting off completely.