Thank you for this picture.Okay, that fan should be compatible with the official case fan, so it should work with the RPiOS configuration setting.
My guess is you are confusing GPIO numbers and pin numbers.
Notice that the physical 2x20 header pin numbers and the GPIO numbers are not the same.
I was using the wrong pin due to this guide from the cooler box.

Now I am using GPIO 18.
Statistics: Posted by leizem — Sun Jan 07, 2024 11:06 am