Did you try to reflash it with new firmware? Or hard reset it 2 times?
If this still didn't work you can try to modify the fan speed maybe you just need to adjust it and decrease or increase the speed of your fan.
I found a solution for modifying the fan speed and frequency you can try this method.
https://bitcointalk.org/index.php?topic=2690140.0Open the images 1 by 1 and edit the fan speed.
Test your miner every time you change the fan speed if there are no changes maybe your fan is not compatible with your miner. So make sure it's compatible on your miner.
I did not try flash it, because as I wrote, after using fan from another antminer it is working ok.
Make sure that the fan you are trying to use has the blue pwm fan cable on the end, some versions of fan QFR1212GHE have this cable in one of the middle sockets.
it was black red yellow blue. in some
old QFR1212GHE datasheet I read that yellow is PWM so i tried swap yellow and blue, it again not work, with different error in kernel.log - can't set fan speed, or something like that. Still I do not understand
why? the QFR1212GHE is not working? it's on bitmain's web site in photo as spare part. Original fan is Martech DF1203812B2UN
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