Cpu Warning Led (Err_Cpu1-2); Catt Led (Catterr_Led1) - Asus TS500-E8-PS4 V2 User Manual

3.

CPU Warning LED (ERR_CPU1-2)

The CPU warning LEDs light up to indicate failure on either CPU1, CPU2, or both.
4.

CATT LED (CATTERR_LED1)

The CATT LED indicates that the system has experienced a fatal or catastrophic error
and cannot continue to operate.
ASUS TS500-E8-PS4 V2 4-19