LG Network Attached Storage with built-in Blu-ray Rewriter N4B1 - Manual (Page 141)

. LG NAS maintenance
11
Self-diagnosis execution.
The LG NAS, by virtue of built in self-diagnosis mode, helps users easily recognize and
handle problems arising on the server.
① When the LG NAS encounters a problem while powering on and running, it
automatically displays self-diagnosis result on the LSC as follows (xx: system
error code, yy: HDD error code)
② Even in the middle of usage, the administrator can open up the administrator
web menu and select the ‘Self-diagnosis’ tab in the ‘Information > Log’ menu,
so the LG NAS immediately runs self-diagnosis.