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FANUC Alarm FXTL-166 — Cannot switch program.

FANUC FXTL-166 (“Cannot switch program.”): Cannot change model program First check: Move the units to the first or last step of the model program before switching.

Updated 2026-09-17 · LogrobotLM reference

Description

Cannot change model program

Remedy

Move the units to the first or last step of the model program before switching.

Related codes

FXTL-164Invalid shim data.FXTL-165Zero shim data.FXTL-167No unit selected.FXTL-168Jog keys are disabled.

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 →