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FANUC Alarm SYST-023 — SYSTEM Teach Pendant communication error

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

FANUC SYST-023 (“SYSTEM Teach Pendant communication error”): A communication cable is broken. First check: Check the teach pendant cable.

Updated 2026-10-22 · LogrobotLM reference

Description

A communication cable is broken.

Remedy

Check the teach pendant cable. Replace the cable if necessary.

Field diagnosis

The teach pendant communication cable is broken.

What to check

  • Check the teach pendant cable and replace it.
  • Note: System alarm: blocking until the teach pendant is seen again.

Related codes

SYST-066PAUSE Teach Pendant communication errorSYST-164WARN Teach Pendant communication errorSRVO-002SERVO Teach pendant E-stopSYST-021WARN System not ready, press resetSYST-022WARN PNS not zero, cannot continueSYST-024WARN PNSTROBE is OFF. Cannot start exec

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 →