Ou ups! Thx for info ;-) For Z9 mini is same problem :-( after flash FW from batch 1 is temp 0 C and fan on maximal rpm
Have you UNchecked "keep settings" ?
Does it help ?
Have you downloaded latest from Bitmain and tested with UNchecked "keep settings" ?
https://service.bitmain.com/support/download?product=Antminer%20Z9%20minicarefully Jiggle cables at fan connector on controllerboard, does it help with fan ?
If problem reading temp for system I guess it will run fan at 100% to protect components so...
carefully jiggle cables from hashboard at connector both on hashboard's AND connectors on controllerboard.
does anything help?
did problem occur when you flashed new firmware ?
try hardware factory restore:
https://enforum.bitmain.com/bbs/topics/3957