duagon MC50M, User Manual, Page: 52 / 85

Functional Description
20MC50M00 E5

2020-10-20 52
3.4.4.1 CPU Board Status LED
Table 8. CPU status LED at front panel
Error Codes
In case of an error, the LED displays the following error messages by repeatedly flashing
n times, then pausing for one second, and then repeating the error code:
Table 9. Error codes signaled via status LED flashes
Label Color Function
2 Yellow Indicates MC50M status messages:

On: MC50M firmware starting

Off: MC50M is switched off

Blinking: MC50M is in stand-by (S3) status

Blinking with n flashes: Error code
During normal operation the LED can be switched on and
off using software.
Number of Flashes Error
1 +3.3 V failure
2 Input voltage failure
3 External power supply failure
4 CPU too hot
5 MC50M firmware timeout
>5 Internal error
See the ACPI Specification for more details on the power states S0 to S5:
Advanced Configuration and Power Interface Specification
Unified EFI Forum
uefi.org/specifications