Gigabyte 990fxa ud3 false temperatures

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Apr 2, 2015
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I have problem with my Gigabyte 990fxa ud3 (rev 3)
One temp sensor sometimes shows -128 Celsius.
That isn't the problem for me, but when it shows that -128 temp, the cpu fan goes to about 200 rpm (realy slow) and then it overheats my cpu.
This happens random and I'm asking that is there any way to keep that cpu fan running atleast 2000 rpm all the time without any hardware fan controller.