LogrobotLM

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FANUC Alarm HOST-142 — WARN Connection error

FANUC HOST-142 (“WARN Connection error”): The Host Comm Protocol could not establish communication with the remote device. First check: Ensure both local and remote are using compatible software versions.

Updated 2026-09-17 · LogrobotLM reference

Description

The Host Comm Protocol could not establish communication with the remote device. Possible software mismatch.

Remedy

Ensure both local and remote are using compatible software versions.

Related codes

HOST-140WARN Device offlineHOST-141WARN Protocol Start/Stop errorHOST-143WARN Comm port cannot be closedHOST-144WARN Comm Tag 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. How this reference is built →