Asus Z9PE-D16-10G/DUAL - Manual (Page 43)

Z9PE-D16-10G Series 2-23
5. Location LED (LOCLED1)
This LED lights for you to conveniently locate the system in error.
6. DIMM warning LED (ERR_DIMMA1/2; ERR_DIMMB1/2; ERR_DIMMC1/2;
ERR_DIMMD1/2; ERR_DIMME1/2; ERR_DIMMF1/2; ERR DIMMG1/2;
ERR DIMMH1/2)
The DIMM warning LEDs light up to indicate an impending failure of the corresponding
DIMMs.
The warning LEDs function only when you enable the ASUS ASMB6.