LogrobotLM

LogrobotLM — AI fault diagnosis for ABB · KUKA · FANUC robots. It reads your robot backup in your browser (never uploaded) and pinpoints the fault. Try it free → · Le diagnostic IA qui lit la sauvegarde de votre robot, sans rien téléverser.

FANUC Alarm SRVO-238 — SERVO Chain 1 (SVON) abnormal

FANUC SRVO-238 (“SERVO Chain 1 (SVON) abnormal”): A single chain 1 (+24V) failure occurred when the SVON (Servo ON/OFF switch) input was asserted. First check: Repair the circuit of chain 1 (+24V) on the SVON hardware.

Updated 2026-08-29 · LogrobotLM reference

Description

A single chain 1 (+24V) failure occurred when the SVON (Servo ON/OFF switch) input was asserted.

Remedy · Remède

Repair the circuit of chain 1 (+24V) on the SVON hardware. Set CHAIN FAILURE detection to TRUE on the SYSTEM/CONFIG screen. Press RESET on the teach pendant.

Frequently asked · Questions fréquentes

What does FANUC alarm SRVO-238 mean?
FANUC SRVO-238 (“SERVO Chain 1 (SVON) abnormal”): A single chain 1 (+24V) failure occurred when the SVON (Servo ON/OFF switch) input was asserted.
How do you troubleshoot FANUC alarm SRVO-238?
Repair the circuit of chain 1 (+24V) on the SVON hardware. Set CHAIN FAILURE detection to TRUE on the SYSTEM/CONFIG screen. Press RESET on the teach pendant.

Related codes / Codes liés

SRVO-236WARN Chain failure is repairedSRVO-237WARN Cannot reset chain failureSRVO-239SERVO Chain 2 (SVON) abnormalSRVO-240SERVO Chain 1 (FENCE) abnormal

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. · Informations indicatives issues du terrain — le manuel du constructeur et ses procédures de sécurité font foi. Ne shuntez jamais un organe de sécurité ; consignez (LOTO) avant toute intervention physique. How this reference is built →