Asus Strix Z790-H GAMING WIFI CPU FAN ERROR WHEN AIO PUMP PLUGGED IN

[Snoobz]

Hello,

I have bought a brand new Asus Strix Z790-H GAMING WIFI motherboard, and I have a Corsair Hydro Series H115i RGB PRO XT (AIO watercooling system).

From my installation, I have plugged the 3 pins cable to the AIO PUMP header on the motherboard and connected both fans of the watercooling system to the fan connectors of the watercooling (not on the motherboard).

The thing is that when the PC boot, I have an error saying no CPU FAN DETECTED. I didn't plug anything in CPU FAN or CPU OPT on the on motherboard, since the watercooling pump is plugged in AIO PUMP header.

What am I doing wrong? Pluggin the watercooling pump in the CPU FAN header does work, the PC boot ..

Should I let the pump plugged into the CPU FAN? Or should I plug it back in the AIO PUMP and disable the CPU FAN in the BIOS?

Why does the system doesn't detect that an AIO PUMP is plugged, and so "disable" the check on the CPU FAN header?

Thank you for your advices!

PS: I have updated my BIOS to the latest version 1202

[JohnAb · Accepted solution]

Hi Snoobz, many motherboards will throw an error if no cpu fan is detected. If your AIO system has a separate power connector (many do) then I would change it to the CPU fan header to eliminate the warning. If the pump is powered entirely by the AIO pump header, then I would leave it there (as that header supplies more power) and turn off the cpu fan warning in the BIOS. You're not doing anything wrong. Perhaps the AIO manual gives some advice on this?

I was going to say that the benefit of using the cpu fan header is that you will get a warning if the pump fails. Just check the power requirements for the pump and make sure that header can supply enough power - it probably can, especially if the AIO has separate power, but just check. 

My corsair AIO just has a single wire going to the 3 pin cpu fan header and so it is only used to sense the speed, not power the pump. 

[Snoobz]

Hello,

Well in fact I didn't think to check the manual of the watercooling system, I only checked the manual of the motherboard ... and the manual of the watercooling system does say to plug the 3pin of the pump to the CPU FAN header.

I guess then I'll stick to that! Since this is what they recommend in their installation manual!

Thank you for the advice!!

[DCLXVIxTIM]

Do you have a single signal wire coming from the head of the cooler? It should go into a 3 pin connector. Plug this into the CPU fan port on the motherboard and this should solve your problem. I just put my PC together last night (same motherboard) and my brother-in-law helped me figure this out.