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FANUC Alarm SRVO-001 — SERVO Operator panel E-stop

Error
Hardware
emergency stop and dual safety chains
Controllers
R-J3iB / R-30iA / R-30iB
FANUC class
PAUSE.G
Hardware family
FANUC emergency stop, pendant and dual safety chain alarms

FANUC SRVO-001 (“SERVO Operator panel E-stop”): The EMERGENCY STOP button on the operator panel or operation box is pressed. First check: 1. Twist the operator panel EMERGENCY STOP button clockwise to release. Likely part: Main board (Main CPU board).

Updated 2026-10-22 · LogrobotLM reference

Description

The EMERGENCY STOP button on the operator panel or operation box is pressed.

Remedy

1. Twist the operator panel EMERGENCY STOP button clockwise to release. Then press RESET. 2. Check the wires connecting the EMERGENCY STOP switch connector CRT8 for continuity. If an open wire is found, replace the entire harness. 3. With the EMERGENCY STOP button in the released position, check for continuity across the terminals of the switch. If continuity is not found, replace the switch. If continuity is found, perform a complete controller backup to save all your programs and settings, then replace the operator panel PCB. 4. If the problem still exists, replace the Main Board.

Field diagnosis

The E-stop button on the operator panel (or control box) is pressed: the emergency stop line is open on the cabinet side.

What to check

  • Unlock the button by turning it, then reset.
  • If the alarm persists with the button released, check the continuity of the wiring between the button and the emergency stop board (marked CRT30 on R-30iB); a broken conductor requires replacing the complete harness.
  • Note: The most common alarm across the fleet; it only becomes a real hardware fault when it will not reset with the button pulled out.

Part to check / replace

FANUC SRVO-001 points to the hardware below — start here before ordering.

Tap a part for every code that points to it — and verify the exact variant for your controller before ordering.

Related codes

SRVO-002SERVO Teach pendant E-stopSRVO-007SERVO External emergency stopsSRVO-201SERVO Panel E-stop or SVEMG abnormalSRVO-277SYSTEM Panel E-stop(SVEMG abnormal)SRVO-003SERVO DEADMAN switch released

Same hardware involved

FRCE-161Main boardFRCE-215Main boardSRVO-021Main boardSRVO-022Main board

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 →