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LogrobotLM — AI fault diagnosis for ABB · KUKA · FANUC robots. It reads your robot backup in your browser (never uploaded) and pinpoints the fault. Try it free → · Le diagnostic IA qui lit la sauvegarde de votre robot, sans rien téléverser.

FANUC Alarm FILE-020 — WARN Illegal file size

FANUC FILE-020 (“WARN Illegal file size”): File size is invalid. First check: Change file size to be correct.

Updated 2026-08-29 · LogrobotLM reference

Description

File size is invalid.

Remedy · Remède

Change file size to be correct.

Frequently asked · Questions fréquentes

What does FANUC alarm FILE-020 mean?
FANUC FILE-020 (“WARN Illegal file size”): File size is invalid.
How do you troubleshoot FANUC alarm FILE-020?
Change file size to be correct.

Related codes / Codes liés

FILE-018WARN File is already openedFILE-019WARN File is lockedFILE-021WARN End of fileFILE-022WARN Illegal file name

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 →