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FANUC Alarm SRVO-254 — E-STOP circuit abnormal (KA5)

FANUC SRVO-254 (“E-STOP circuit abnormal (KA5)”): Welding occurs at a relay in E-STOP circuit. First check: Replace an E-STOP unit. Likely part: E-stop unit (E-stop unit).

Updated 2026-09-17 · LogrobotLM reference

Description

Welding occurs at a relay in E-STOP circuit.

Remedy

Replace an E-STOP unit.

Part to check / replace

FANUC SRVO-254 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-252Current detect abnlSRVO-253Amp internal over heatSRVO-255E-STOP circuit abnormal (KM2)SRVO-256MCC control circuit abnormal (AMP)

Same hardware involved

SRVO-021E-stop unitSRVO-134E-stop unitSRVO-136E-stop unitSRVO-348E-stop unit

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 →