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FANUC Alarm APSH-165 — WARN Invalid Studgun Selection

FANUC APSH-165 (“WARN Invalid Studgun Selection”): There I/O configuration for the proper studwelding gun has not been initialized. First check: Proceed to the Spot Equipment I/O setup screen and configure the digital inputs Gun Present = On/Off, Gun in Nest = On/Off for the 2 stud guns.

Updated 2026-09-17 · LogrobotLM reference

Description

There I/O configuration for the proper studwelding gun has not been initialized.

Remedy

Proceed to the Spot Equipment I/O setup screen and configure the digital inputs Gun Present = On/Off, Gun in Nest = On/Off for the 2 stud guns. Proper configuration if gun 1 is on the robot is for Gun 1 (Gun Present = ON, Gun in Nest = OFF and for Gun 2 (Gun Present = OFF, Gun in Nest = ON. Proper configuration if gun 2 is on the robot is for Gun 1 (Gun Present = OFF, Gun in Nest = ON and for Gun 2 (Gun Present = ON, Gun in Nest = OFF.

Related codes

APSH-163WARN No motion allowed--gun closedAPSH-164WARN Home I/O program … not loadedAPSH-166WARN Studgun Change UnsuccessfulAPSH-167WARN Move robot home & cycle start

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 →