Asus Z9PE-D16 - Manual (Page 56)

2-38 Chapter 2: Hardware information
2. BMC LED (BMC_LED1)
The green heartbeat LED blinks per second to indicate that the ASMB6 is working
normally.
The heartbeat LED functions only when you install the ASUS ASMB6
Everytime after the AC power is replugged, you have to wait for about
30 seconds for the system to power up.
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3. CPU warning LED (ERR_CPU1, ERR_CPU2)
The CPU warning LEDs light up to indicate an impending failure of the corresponding
CPU.
The warning LEDs function only when you install the ASUS ASMB6.