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FANUC Alarm HOST-139 — WARN Invalid function

FANUC HOST-139 (“WARN Invalid function”): The Host Comm Protocol does not support the requested function. First check: Check the Host Comm Protocol to ensure the function is supported.

Updated 2026-08-29 · LogrobotLM reference

Description

The Host Comm Protocol does not support the requested function.

Remedy · Remède

Check the Host Comm Protocol to ensure the function is supported.

Frequently asked · Questions fréquentes

What does FANUC alarm HOST-139 mean?
FANUC HOST-139 (“WARN Invalid function”): The Host Comm Protocol does not support the requested function.
How do you troubleshoot FANUC alarm HOST-139?
Check the Host Comm Protocol to ensure the function is supported.

Related codes / Codes liés

HOST-137WARN Request cancelledHOST-138WARN Request abortedHOST-140WARN Device offlineHOST-141WARN Protocol Start/Stop error

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 →