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FANUC Alarm SYST-042 — PAUSE DEADMAN defeated

Error
Hardware
emergency stop and dual safety chains
Controllers
R-J3iB / R-30iA
FANUC class
PAUSE.G
Hardware family
FANUC teach pendant, main board, CMOS and controller battery alarms

FANUC SYST-042 (“PAUSE DEADMAN defeated”): The mode switch was changed from T1 or T2 mode to AUTO mode and the DEADMAN was already pressed. First check: Release the DEADMAN and press RESET.

Updated 2026-10-22 · LogrobotLM reference

Description

The mode switch was changed from T1 or T2 mode to AUTO mode and the DEADMAN was already pressed. The DEADMAN must be released when switching to AUTO mode

Remedy

Release the DEADMAN and press RESET.

Field diagnosis

The mode select switch was turned from T1/T2 to AUTO while the deadman switch was already pressed.

What to check

  • Release the deadman switch and reset.
  • Note: Protection against a deadman switch held down by a rubber band.

Related codes

SRVO-003SERVO DEADMAN switch releasedSYST-037ABORT Key switch brokenSYST-040PAUSE Operation mode AUTO SelectedSYST-041PAUSE Ovrd Select could not ENABLEDSYST-043PAUSE TP disabled in T1/T2 modeSYST-044SYSTEM (Abnormal) TP disabled in T1/T2 mode

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 →