Ultracon

I had this issue with flickering/dimming rgb lights on the pump head. I’m pretty sure I fixed the issue. These AIO pumps require a constant 12v of power. So attaching the pump head to its own SATA cable with nothing else drawing power off it helped. But in my case I use an Asus Prime z390-A Mobo, and they use a program in the Bios called Q-fan control that automatically adjusts fan speed but also voltage to the AIO. Once I went in and turned that off along with the pump being powered by it’s own personal SATA cable with nothing else on it, the flickering/dimming rgb lights stabilized. I’m not familiar with every Mobo out there, but make sure your AIO is getting a consistent 12v of power.

I had a similar problem with my H100i Platinum. The RGB lighting on the pump head would flicker and degrade over time to darker Colors no matter if I had the lighting set to the default rainbow or arc or plain static. I would reinstall iCue and that would fix the problem for maybe a day or so before the flickering/colour dim would start again. I have no background in computer building, but after a lot of research and trouble shooting I came across a post saying the pumps need a CONSTANT 12v supply of power. I had the AIO powered by a SATA cable that was also powering something else(don’t remember what it was). Once I took the AIO off that SATA cable and gave it its own personal cable with nothing else attached, the problem went away...for about 3ish days, then started happening again, but less than before. So I figured the AIO’s RGB light flicker and dim problem must have something to do with not getting a consistent 12v at all times. After more research I realized that Asus Mobo’s(I’m using the Asus Prime z390-a motherboard)have this thing called Q-fan control in the Bios that automatically adjusts fan speed and more importantly voltage to the AIO. I went into the Bios and shut that sucker off and the colour flicker/dim has been stable for about 5 days. So I’m pretty sure the issue is resolved but here’s hoping! Hopefully that’s all your problem is and you get it figured out!