I have messaged technical support, but it n the meantime...
My case fan has never spun or lit up in my InWin case. I guess it's not connected properly, but I'm not sure how to tell as the connection side is next to the motherboard as far as I can work out.
Any ideas?
Managed to sort it. Seems it was just a loose connection under the lid of the case where the fan speed switch was. All spinning and lighting up fine now.