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  1. #1
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    Maximus VIII Hero PWM fan control not working

    Hello

    I am using an Asus Maximus VIII Hero with a 6700K in my new build. The CPU is cooled by a CM 212X air cooler, which comes with a PWM controlled fan.

    At first, the fan control on the board worked great (Q-fan PWM mode). However, after about a day or so of use after flashing my BIOS from 1202 to 1504, I noticed the fan has started running at full speed,

    I went into the BIOS and no matter what settings I tried for the fan curve, it would not slow down. This was happening under both "auto" and "PWM" control modes. I then tried "DC mode" and it immediately throttled the fan speed back, so it just seems the PWM function is what is faulty here.

    I have tried flashing my BIOS back to the previous release (14xx), and also hitting the "CLRCMOS" button on my board and reentering all my settings manually. However, this has made no difference to the situation and DC mode is still all that will allow me to control the speed of my fan.

    Any ideas what could be wrong here?

    Thanks

  2. #2
    ROG Guru: Yellow Belt Array Code_Frenzy PC Specs
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    MotherboardMaximus VIII Hero Alpha
    Processori7-6700k
    Memory (part number)LPX 3000MHz DDR4 (CMK16GX4M2B3000C15)
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    As a quick test and a way to narrow down the cause of the fault, can you control the fan speed using PWM whilst in the BIOS?

  3. #3
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    Try reconnecting your fan cable. If that doesn't work, test your fan on another fan header.

  4. #4
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    Quote Originally Posted by Code_Frenzy View Post
    As a quick test and a way to narrow down the cause of the fault, can you control the fan speed using PWM whilst in the BIOS?
    Sorry, the above details were all describing the behaviour in the UEFI. I don't actually have the AI suite software installed so any changes I make are in the UEFI BIOS.

    Chino, I'll test that now and get back to you.

    Thanks

  5. #5
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    OK, tried as suggested. On one of the Chassis Fan headers, the CPU cooler fan behaves in exactly the same way. If I set DC mode, the header controls the fan just fine. If I set it to PWM or auto, the fan runs full speed.

    Reconnecting the fan cable didn't make a difference unfortunately.

  6. #6
    ROG Guru: Yellow Belt Array hiong PC Specs
    hiong PC Specs
    MotherboardAsus Maximus VIII Extreme
    ProcessorIntel i7-6700K
    Memory (part number)F4-3600C16D-16GTZ
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    Storage #1Samsung 950 Pro M.2 512GB
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    Quote Originally Posted by Odaik View Post
    OK, tried as suggested. On one of the Chassis Fan headers, the CPU cooler fan behaves in exactly the same way. If I set DC mode, the header controls the fan just fine. If I set it to PWM or auto, the fan runs full speed.

    Reconnecting the fan cable didn't make a difference unfortunately.
    then it's likely a fault with the fan itself. do you have another PWM fan on hand to conclusively test the fan headers?

  7. #7
    ROG Guru: Gold Belt Array Menthol PC Specs
    Menthol PC Specs
    MotherboardM 10 Apex / XI gene
    Processor8700K / 9900K
    Memory (part number)2x8 Gskill Trident Z 4266/2x2x8 Gskill Trident Z 4500
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    I would also suspect the fan, you could always flash back to the older bios if you had no issues before

  8. #8
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    Just thought I'd update this thread.

    I tried another PWM fan and it worked fine under PWM control so it does indeed look to be a faulty PWM circuit on the fan. Thanks guys!

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