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FANUC Alarm SRVO-237 — WARN Cannot reset chain failure

FANUC SRVO-237 (“WARN Cannot reset chain failure”): Reset chain failure detection cannot be executed. First check: Repair the circuit of the chain 1 (+24V) on the hardware.

Updated 2026-09-17 · LogrobotLM reference

Description

Reset chain failure detection cannot be executed.

Remedy

Repair the circuit of the chain 1 (+24V) on the hardware. Press the emergency stop on the teach pendant and twist the teach pendant emergency stop push button clockwise to release. Press RESET.

Related codes

SRVO-235SERVO Short term Chain abnormalSRVO-236WARN Chain failure is repairedSRVO-238SERVO Chain 1 (SVON) abnormalSRVO-239SERVO Chain 2 (SVON) 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. How this reference is built →