Which motherboard header is the fan hooked into? My guess is the motherboard is controlling the fan on the header that it’s plugged into. Normally that can be changed in the bios so that it runs at full speed. The software will allow control but needs the bios to give it full power.

OK fixed it.....with it connected to the SYS CPU it still does not register fan speed or control UNTIL you set the fan to FULL SPEED in the Gigabyte SIV app.

OK this is not resolved at all.....I now get a message popup when I try to launch flow control: CPUWB Device Not Found...which means what?

Thank you

"Can you give me some information on this set up. Do you have any of your radiator fans installed to the motherboard or the Y-spliter?"
 
The radiator fans are connected to the Y Splitter.
 
"Also do you have the 3 pic CPU header installed to CPU1 header on your motherboard?"
 
The 3 Pin CPU Header is connected to CPU FAN, but....I just read that the CPU OPT is for Water Cooling CPU Fan Header, so I shall try that now and report back.

I also ran the AURUS Smart Fan Calibration on the pump, it slowly wound down the pump speed and fan speed during the calibration, and now they both sit a ZERO and do not come on at all.....

bob16314
Yes, the manual leaves some to be desired.
I would connect the 3-pin pump connector to the SYS_FAN5_PUMP or SYS_FAN6_PUMP headers (System Fan/Water Cooling Pump Headers).
Then I would clear CMOS (Page 39 in your mobo manual) because some software/utilities will change BIOS settings/Fan header/Smart Fan settings..Things may be all messed up now.
After you clear CMOS it might be a good idea to reinstall, or uninstall and reinstall, the EVGA Flow Control Software.
Make sure the Mini USB cable for the pump is connected to a motherboard USB header, which I'm sure you probably did.

Thank you for this....this is how I originally had it setup and seems to be the most logical path. After trying a number of configurations, even hooking fans directly to motherboard etc, I am now back to this setup. I also did as you suggest and cleared the CMOS, so I am truly back to square one here...
 
So after booting up, I am also back to having the Flow Control software NOT showing fan speed at all.... To be honest I am totally regretting this purchase. I am ready to send it back and just get a simple air cooler as nothing I have tried with this thing will keep my i9 9900K CPU cool enough.
 
I do not think it is a good thing for the CPU to sitting at 95 degrees for several minutes while a video rips out etc, it is sitting to close for comfort to that 100 degree mark. THIS is the reason I bought a water cooler, to prevent this, but so far just a world of frustration.

OK...I have it working it seems. The FAN speed shows ZERO until they kick into a higher RPM it seems. To get the pump and fans to really perform however requires setting the Fan Performance on the motherboard to PERFORMANCE or FULL SPEED. Having set it to FULL SPEED, the pump is now running at 2900 RPM constantly, the fans are varying, sitting at 1300 rpm now with water coolant at 31.7 degrees celcius.
 
It seems to me that the water pump speed SHOULD be varying also, but is not. I can of course control the pump speed a bit with the slider on the left side of FLOW CONTROL, but even on it's lowest setting it is still running at 1920 rpm. So my question now, why is it not be automatically varied?

So I plugged my CLC 280 fan cord into the 4 pin CPU_FAN spot on the motherboard, then I set the CPU FAN to PWM in BIOS.   HWMonitor shows the CPU_FAN at a constant RPM, however, Flow Control is adjusting the fan speed and reports ranges from 1040 up to the max (I cannot recall off the top of my head).  The only problem I have is when I try to configure custom curve control for both Fan and Pump Curve in Flow Control, the check box will only allow me to do Fan or Pump Curve.  I cannot have a custom curve control for both.  Seems really stupid to me.. but if I check one the other unchecks.    I have a Gigabyte Aorus Z390 Ultra with EVGA CLC 280.

Some /(Most ?) AIO pumps Do Not like or support PWM feature.  They rely on the Software to control speed 
 
With EVGA CLC ---> Make sure the fan header setting in BIOS is set to MAX or 100%. Do not use a PWM fan curve for the header you connect the CLC to.
 
FAQ:59704

Similar issue. As I have to set the CPU_FAN header to run at 100% in BIOS for the AIO to get enough power that makes my fans spin constantly at 1400RPM in BIOS and HWMonitor but Flow Control reads the fan speed at 1050RPM which isn't correct. I wonder if the Corsair H110i is the same way? first AIO. Really like the CLC 240mm but at 1400RPM it makes a low humming noise. Might have to replace the fans I guess.

HC-Filppula
I have the same problem. I have a 360 CLC and an EVGA FTW Z490 MoBo.. The same pop up: CPUWB NOT FOUND

 
some basics are here - like to set MB header to 100% & Do not use a PWM fan curve for the header you connect the CLC to.

FAQ # 59704  EVGA CLC Flow Control software disconnects from USB or shows "No USB Device Found"
 
If you are receiving an error message when trying to install EVGA Flow Control or have
disconnecting issues while using the software please try the following steps:

We recommend connecting the CLC fan header to the CPU1 or CPU2 header on your motherboard.

Make sure the fan header setting in BIOS is set to MAX or 100%. Do not use a PWM fan
curve for the header you connect the CLC to.

If your motherboard has a fan header designated for a "Pump" you should connect the CLC
fan header to this specific location.

If you continue to have this issue or have a related problem without a solution, please
contact EVGA support