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FANUC Alarm MEMO-103 — WARN Check sum error occurred

Warning
Hardware
main board and memory
Controllers
R-J3iB / R-30iA
FANUC class
WARN
Hardware family
FANUC storage media alarms: memory card, USB, F-ROM and corrupted data

FANUC MEMO-103 (“WARN Check sum error occurred”): The specified data was broken. First check: Perform a cold start: 1.

Updated 2026-10-22 · LogrobotLM reference

Description

The specified data was broken. This is the internal error.

Remedy

Perform a cold start: 1. Turn off the robot. 2. On the teach pendant, press and hold the SHIFT and RESET keys. 3. While still pressing the SHIFT and RESET keys, turn on the robot. If the error is not cleared, document the events that led to the error and call your FANUC Robotics technical representative.

Field diagnosis

The designated data is corrupted: internal checksum error.

What to check

  • Cold start (SHIFT + RESET at power-up).
  • If the error persists, document it and contact support.
  • Note: With SYST-035 in the history, the main board battery is the cause.

Related codes

SYST-031SYSTEM F-ROM parityMEMO-130SYST Please power up againSYST-035WARN Low or No Battery Power in PSU.MEMO-098WARN EOF occurs in file accessMEMO-099WARN Program name is wrongMEMO-104WARN Program already exists

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 →