This is truouleshooting for Antminer controller & fan problem. Besides the suggestions in Tutorial: General Mining Guide & TroubleShoot for Antminer Models, here are some more troubleshooting ways.

Can’t get into miner configuration page

Possible causes and solutions:

• Mining software problem -> Reset. Instructions for resetting: https://www.eastshore.xyz/how-to-reset-antminer/
• Incompatible Internet browser -> Change a browser
• IP address problem (one is static and another is dynamic) -> Set both as static. Instructions for finding the IP: https://www.eastshore.xyz/how-to-scan-out-the-configuration-ip-address-of-the-miner/
• MAC repeated (applicable for T9+、S9i) -> update firmware: https://www.eastshore.xyz/how-to-upgrade-the-firmware-for-a-bitcoin-miner/
• Problem due to that miners moved to new location
  • Set the network of the new location as that of the old location
  • Restore to factory settings.
  • Restart the miners
• Control board problem -> Request warranty repair

IP address missing

Possible causes and solutions:

• Mining software problem -> Reset. Instructions for resetting: https://www.eastshore.xyz/how-to-reset-antminer/
• Router problem (DHCP is not activated)  -> Activate DHCP mode of the router
• Ethernet cord problem -> Change an Ethernet cord
• Couldn’t find the IP -> Instructions for finding the IP: https://www.eastshore.xyz/how-to-scan-out-the-configuration-ip-address-of-the-miner/
• Control board problem -> Request warranty repair

Fan undetected

Possible causes and solutions:

• The fan is not properly connected -> Reconnect the fan
• Fan port on the control board damaged -> Request warranty repair
• Fan damaged -> Change the fan or request warranty repair

Hash boards undetected

Possible causes and solutions:

• Cable connection issue -> Power off the miner and reconnect the cable or change the cable.
• Port damaged -> Request warranty repair
• Control board problem -> Request warranty repair

Hash speed undetected

Possible causes and solutions:

• Pool issue -> Change to another pool
• Fan issue -> Change the fan
• Hash board damage -> Request warranty repair
• Control board issue -> Request warranty repair
• Network problem -> Check the network

Indicator lights for Internet port not working

Possible causes and solutions:

• Ethernet cord issue -> Plug the Ethernet cord properly
• Control board issue -> Request warranty repair
• Switch issue -> Check the switch

Spin speed of fans is too low (the speed difference of the 2 fans should be below 3000)

Possible causes and solutions:

• Change the fan, if it doesn’t help, request warranty repair.

Kernel log page shows fan issue

Go to Kernel log page, search “error”, if it shows: Fatal Error: some Fan lost or Fan speed low.

Possible causes and solutions:

• Fan not connected properly -> Reconnect the fan
• Fan port on the control board damaged -> Request warranty repair
• Fan damaged -> Request warranty repair

Third fan detected

Possible causes and solutions:

• Replace the two fans one by one, see it goes away.
• If both fans changed yet problem persist, request warranty repair.

Fan spin speed exceeds 7000

Possible causes and solutions:

• Replace the two fans one by one, see it goes away.
• If both fans changed yet problem persist, request warranty repair.