In most Fanuc implementations, a "WN" code refers to a (as opposed to an "AL" for Alarm).
This is not a critical machine failure, but rather a . Here is a breakdown of what it means, why it appears, and how to resolve it. fanuc wn57 override function is active
A: Check for a stuck physical switch (internal contact failure). Use the FANUC diagnostic screen (DIAGNOSIS → PMC → SIGNAL) to see if G104.0 (MLK) reads "1" even when the switch is off. This indicates a hardware failure in the I/O unit. In most Fanuc implementations, a "WN" code refers