problem Fan speed reported as too low f5 1500,

Here's an old askf5 solution which might help, although your platform type isn't listed.

https://support.f5.com/kb/en-us/solutions/public/11000/200/sol11228

Best thing is to get a qkview and upload to ihealth.f5.com and check the Diagnostics section.

Hope this helps,

N