FANUC Alarm SPOT-042 — WARN Stud Welder Time Out Fault
FANUC SPOT-042 (“WARN Stud Welder Time Out Fault”): The robot detected a Stud Welder Time Out Fault from the current controller during a weld. First check: Once the robot is paused, carefully pry the gun and the stud apart, then reset fault on weld controller and resume the program.
Updated 2026-09-17 · LogrobotLM reference
Description
The robot detected a Stud Welder Time Out Fault from the current controller during a weld. This fault occurrs when the controller does not detect a completed weld or a bad weld after the timer times out. Usually means that the stud is welded to both the target and the gun.
Remedy
Once the robot is paused, carefully pry the gun and the stud apart, then reset fault on weld controller and resume the program.
Related codes
Indicative field information — the robot manufacturer's manual and safety procedures always prevail. Never bypass a safety device; apply lockout/tagout (LOTO) before any physical intervention. How this reference is built →