I am receiving a BIOS error 512 "Chassis Fan Not Detected" on startup ever since removing the Asetek liquid cooler and replacing it with an Intel fan driven heatsink. There are 3 fan connections on my motherboard. CPU FAN - 4 Pin - Previously connected to the 80mm case fan that was mounted to the heat exchanger/radiator from the Asetek cooler. I am still using this same fan but have it mounted to the back of the case without the radiator. PUMP FAN - 4 Pin - Previously connected to the Asetek water pump.

https://www.bleepingcomputer.com/forums/t/785080/bios-error-512-chassis-fan-not-detected-after-replacing-liquid-cooler-with-fan/

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