Did you switched the 2 fans and checked if the fan in shows 0 rpm then? I see zigminer says its the fan that is the problem? I think its the controler unit but you could easily check it on this way
Regarding fan detection, the next version will be added to fan speed check
You have a date for this?
My miner stoped working 10 days ago bcuz of this problem.
It shows 0 RPM for the out fan but the fan if turning at full speed.