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Thread: Imac mid-2011 CPU fan low speed (420 rpm)

  1. #1


    Member Since
    Jul 12, 2018
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    Imac mid-2011 CPU fan low speed (420 rpm)
    Hi everybody (sorry for my poor english but i am french from Bordeaux...)

    I am the happy user of an imac 27" mid-2011 i5 2.7 ghz (version 12,2) since 2012.

    Recently, i noticed that the left high part of the screen heated a lot and made an apple diagnosis that obtained the error 4MOT/4/4000003: HDD-1487
    I also installed MacFan who indicated 0 RPM for CPU fan.
    I also replaced CPU fan with a resturbished one and in the same time installed an SSD on the first SATA port and leaved the original HDD on the second one.

    Since this operation, i have the error 4MOT/4/4000002: CPU-391 and CPU fan which turns to 380-430 RPM but can't modify the speed with MacFan. The CPU temperature somtimes reach 70 C (158 F).

    I red the problems of probe which can cause an acceleration of this fan, but nothing on a low speed.
    I also wished to test the fan (maybe the resturbished is also altered ?) with a PWM prototype but didn't found any thing about the connector pin out of my imac version.

    I am a little lost ...

    Thank you for your help.

  2. #2

    chscag's Avatar
    Member Since
    Jan 23, 2008
    Location
    Keller, Texas
    Posts
    55,791
    Welcome to our forums.

    Your English is a lot better than my French.

    The error you're receiving is a temperature sensor error. From your description, I can't tell if it's because the sensor itself is defective or because you installed an SSD in addition to the HDD. Why don't you disconnect the HDD as a test to see what the fans speeds are and the temperatures?

    Your 2011 iMac actually has three sets of temperature sensors and fans: HDD, CPU, and Optical Drive. And yes, it's possible that the refurbished fan you bought is likewise defective.

  3. #3


    Member Since
    Jul 12, 2018
    Posts
    2
    Quote Originally Posted by chscag View Post
    Welcome to our forums.

    Your English is a lot better than my French.

    The error you're receiving is a temperature sensor error. From your description, I can't tell if it's because the sensor itself is defective or because you installed an SSD in addition to the HDD. Why don't you disconnect the HDD as a test to see what the fans speeds are and the temperatures?

    Your 2011 iMac actually has three sets of temperature sensors and fans: HDD, CPU, and Optical Drive. And yes, it's possible that the refurbished fan you bought is likewise defective.
    Thx a lot for your advises. I'll try it this weekend and report you the results after.

    Have a nice day !

    Olivier

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