Hi Luke,
The fan in Pegasus can not be manually control.
If you think that is abnormal case, it might need to RMA.
Before we can process your request, kindly create an account and register your product to our support website.
Please find the link here: http://support.promise.com/ (Below Link is the manual “Register and Create Support Case on Promise Website".
https://fc.promise.com.tw/links/f5e5c8c1-eca9-4960-8221-f509cfaec264
The system will connect you to our technical support in your region.
Should you have any questions regarding the registration, please do not hesitate to contact us.
Thanks for your understanding and cooperation.
Jerry Lin