LogrobotLM

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FANUC Alarm PNT1-139 — Cannot reset chain failure

FANUC PNT1-139 (“Cannot reset chain failure”): Reset chain failure detection cannot be executed. First check: Repair the circuit of the chain 1 (+24V) on the hardware, press the E-STOP button on the teach pendant, and turn the teach pendant E-STOP button clockwise to release it.

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 E-STOP button on the teach pendant, and turn the teach pendant E-STOP button clockwise to release it. Then, press RESET.

Related codes

PNT1-137Short term Chain abnormalPNT1-138Chain failure is repairedPNT1-140Brake Release Switch OnPNT1-151Col … range err/preset %override

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 →