Quote from: Maxcoin88 on April 22, 2014, 11:11:49 PM

Hi, does anyone know how to reset fan control on the S2?

I have recently purchased two Antminer S2 units. One of the unit is working perfectly but I have a problem with the second unit running the fans at full speed all the time.

In the miner web interface I can see that the Fan 1 is showing 0 instead of the fans rpm but the fan is working at full speed ( all the other fans are working also ) but it wont adjust speed to control the fan loudness.

On the other unit everything is working good and Fan 1 is showing rpm.

I tried unplug and replug the fan on the board but it is still the same fans are running at maximum speed all the time. I tried upgrading firmware ( succedeed without problem ) , I also tried a hard reset but it has changed nothing.

This is very loud and consuming.

I guess it is related with the firware but upgrading didnt help.

Is there any way to adjust / control / reset the fan control?

The S2 has a total of 5 fans, but the motherboard has 6 places to connect a fan. Only fans 1-4 are monitored by the Web GUI. So, when the factory banged out hundreds of S2's in a short period of time, guess what happens....

All 3 of my S2's have their fans connected differently. I don't have the problem you describe, but perhaps it happens if two of your main fans are connected to plugs 5 and 6 rather than 1-4?