Interesting so both the H60 & H80 on the ASUS P9X79 Deluxe 'can' cause a Debug LED of C0.
I know the H100 and H80's with the same head unit of the H100 on the ASUS P9X79 Deluxe and other ASUS X79's hasn't caused an issue which makes me question the Header's communication. So my best 'guess' is: A. Bad Pump unit on the Corsair <or> B. Bad installation. Chances are 'B' Bad Installation.
The H60 differs from both the H80 & H100 in that there's no 4-pin Molex (dedicated for pump) and the (2) Fan Headers differ. The H60 requires the 'Pump' header to be connected to 100% 'on' FAN_Header (most new ASUS are all PWM and regulated) so the power must be set in the BIOS to 'Q-Fan -> Disabled' for the pump and the Fan's Header should be attached to the 'CPU_FAN' for the radiator fan to allow variable speed operation.
Therefore, I'd go into the BIOS and change 'Q-Fan -> Disabled' for the pump's header pronto.