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FANUC Alarm ARC-166 — STOP Comm. stopped in weld(E:…)

Manufacturer wording — STOP Comm. stopped in weld(E:%d)
The manual prints placeholders; your controller fills them in with the real group, axis or number.

FANUC ARC-166 (“STOP Comm. stopped in weld(E:…)”): Communication with RoboWeld power source stopped in welding. First check: Confirm another error message and port, cable setup.

Updated 2026-09-17 · LogrobotLM reference

Description

Communication with RoboWeld power source stopped in welding.

Remedy

Confirm another error message and port, cable setup.

Related codes

ARC-164STOP Power source error(E:…)ARC-165STOP EQ is detached(E:…)ARC-167SYSTEM I/O asginment overlap(E:…)ARC-168SYSTEM I/O error(…, E:…)

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 →