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FANUC Alarm LNTK-028 — STOP LNTK stack underflow

FANUC LNTK-028 (“STOP LNTK stack underflow”): The tracking stack attempted to read more data than was present. First check: Perform a COLD start of the system.

Updated 2026-09-17 · LogrobotLM reference

Description

The tracking stack attempted to read more data than was present.

Remedy

Perform a COLD start of the system. (Cycle power.) Notify FANUC Robotics if problem persists.

Related codes

LNTK-026STOP Encoder not enabledLNTK-027STOP Invalid data on LNTK stackLNTK-029STOP LNTK stack overflowLNTK-030STOP Stack / header mismatch

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 →