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FANUC Alarm ARC-049 — WARN Process %d switch to %d failed

FANUC ARC-049 (“WARN Process %d switch to %d failed”): ArcTool failed to switch weld processes. First check: The weld power supply may be OFF, unconnected, or data in the second process may be incorrect.

Updated 2026-08-29 · LogrobotLM reference

Description

ArcTool failed to switch weld processes.

Remedy · Remède

The weld power supply may be OFF, unconnected, or data in the second process may be incorrect.

Frequently asked · Questions fréquentes

What does FANUC alarm ARC-049 mean?
FANUC ARC-049 (“WARN Process %d switch to %d failed”): ArcTool failed to switch weld processes.
How do you troubleshoot FANUC alarm ARC-049?
The weld power supply may be OFF, unconnected, or data in the second process may be incorrect.

Related codes / Codes liés

ARC-047WARN Not allowed during a weldARC-048WARN Auto AI/O setup is unsupportedARC-050WARN Process %d NOT foundARC-051WARN Weld EQ ONLINE: %s

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. · Informations indicatives issues du terrain — le manuel du constructeur et ses procédures de sécurité font foi. Ne shuntez jamais un organe de sécurité ; consignez (LOTO) avant toute intervention physique. How this reference is built →