Asus AW171 - Manual (Page 30)

2-10 Chapter 2: Hardware information
2.3.4 Connecting the CPU fan cable
When the fan, heatsink, and the retention mechanism are in place,
connect the CPU fan cable to the connector on the motherboard labeled
CPU_FAN.
4. Push down the retention bracket lock on the retention mechanism to
secure the heatsink and fan to the module base.
Don’t forget to connect the CPU fan connector! Hardware monitoring
errors may occur if you fail to plug this connector.
2.3.5 CPU heatsink and fan Qualified Vendors List
The following table lists the CPU heatsink and fan assembly that have
been tested and qualified for use with this motherboard.
Vendor Part Number
Thermaltake A1724
Foxconn NBT-K5011NE1DBVCB-001
Ajigo MF043-044
CPU Fan Connector
(CPU_FAN1)