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FANUC Alarm SYST-154 — WARN No start in ISOLATE/BYPASS mode

FANUC SYST-154 (“WARN No start in ISOLATE/BYPASS mode”): Production start received when controller is in ISOLATE or BYPASS mode First check: Put controller into AUTO or INTERLOCK mode before doing this operation

Updated 2026-09-17 · LogrobotLM reference

Description

Production start received when controller is in ISOLATE or BYPASS mode

Remedy

Put controller into AUTO or INTERLOCK mode before doing this operation

Related codes

SYST-152WARN Cannot force DO’s in AUTO modeSYST-153WARN Cannot SIM/UNSIM DO’s in AUTO modeSYST-155ABC overrunSYST-156SYSTEM Unknown hard ware

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 →