Asus Z11PA-D8 Series User Manual page 40

5. Message LED (MESLED1)
This onboard LED lights up to red when there is a BMC event log is generated.
6. CATT LED (CATTERR_LED1)
The CATT LED indicates that the system has experienced a fatal or catastrophic error
and cannot continue to operate.
2-22
Chapter 2: Hardware Information