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FANUC Alarm SYST-031 — SYSTEM F-ROM parity

Error
Hardware
main board and memory
Controllers
R-J3iB / R-30iA
FANUC class
SYSTEM
Hardware family
FANUC teach pendant, main board, CMOS and controller battery alarms

FANUC SYST-031 (“SYSTEM F-ROM parity”): An error has occurred accessing F-ROM First check: Perform a cold start: 1.

Updated 2026-10-22 · LogrobotLM reference

Description

An error has occurred accessing F-ROM

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

Error detected when accessing the F-ROM flash memory.

What to check

  • Cold start (SHIFT + RESET held at power-up).
  • If the error persists, document it and call support: the main board or its memory module is at fault.
  • Note: Back up everything that is still readable before the Cold start.

Related codes

MEMO-147WARN Flash File access error(write)MEMO-148WARN Flash File access error(read)MEMO-103WARN Check sum error occurredSYST-029PAUSE Robot was connectedSYST-030PAUSE Robot was isolatedSYST-032WARN ENBL signal from UOP is lost

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 →