It seems the fan port is damaged.

Can you try to hard reset it first and maybe this is just a program issue.

you can follow the guide from here "How to reset miner to factory settings".

Do the first and 3rd procedure and ignore the 2nd method. If it doesn't work the control board might be damaged. If you have extra s11 you can try to replace it for testing to find if it's just a fan issue or the control board.