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FANUC Alarm TAST-004 — STOP TAST IO start failed

FANUC TAST-004 (“STOP TAST IO start failed”): IOSETRTN error has occurred First check: Perform a cold start of controller

Updated 2026-08-29 · LogrobotLM reference

Description

IOSETRTN error has occurred

Remedy · Remède

Perform a cold start of controller

Frequently asked · Questions fréquentes

What does FANUC alarm TAST-004 mean?
FANUC TAST-004 (“STOP TAST IO start failed”): IOSETRTN error has occurred
How do you troubleshoot FANUC alarm TAST-004?
Perform a cold start of controller

Related codes / Codes liés

TAST-002STOP TAST error IO allocationTAST-003STOP TAST IO initialization failedTAST-005WARN TAST time tick missingTAST-006STOP TAST memory dispose failure

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 →