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FAQ > Industrial Motherboard
IMBA-Q870-i2-R10 - Why SYS_FAN1 doesnt' start/spinning sometimes perhaps SYS_FAN2 is always spinnin?
IMBA-Q870-i2-R10 - Why SYS_FAN1 doesnt' start/spinning sometimes perhaps SYS_FAN2 is always spinnin?
KBA-01203-MBBM3F
Brief Description
This is normal because SYS_FAN1 is controlled by iWDD in BIOS for Smart-functions sensing based on system's environments.
Solution
SYS_FAN1 can rotate when system/chassis goes beyond some temperature level ~40 deg C, otherwise it will be stop rotating and this can be monitored and viewed in BIOS under iWDD hardware monitor.
Remark

SYS_FAN2 is connected by Vcc to run always!

CPU_FAN is separated than above SYS_FAN's.

This condition is applied for most of ATX-motherboards from IEI!


2016/09/09
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