FANUC Alarm APSH-166 — WARN Studgun Change Unsuccessful
FANUC APSH-166 (“WARN Studgun Change Unsuccessful”): The robot was aborted or interrupted during the studgun change sequence. First check: Manually change the stud guns and move the robot to the home position.
Updated 2026-09-17 · LogrobotLM reference
Description
The robot was aborted or interrupted during the studgun change sequence.
Remedy
Manually change the stud guns and move the robot to the home position. Press cycle start to run production.
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 →