LogrobotLM

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ABB Error 37109 — Brake release failure

Error

ABB 37109 (“Brake release failure”): Brake release failure: the brakes of the indicated mechanical unit fail to release. Likely part: Relais de frein / Configuration E/S (Relais de frein / Configuration E/S).

Updated 2026-10-22 · LogrobotLM reference

What it means

Brake release failure: the brakes of the indicated mechanical unit fail to release. The mechanical unit may not move when the motors are powered on.

What to check

  • Check that the external brake relay (if used) is correctly declared in the configuration file.
  • Check the declaration of the corresponding I/O signal in the I/O configuration.
  • Check the physical connection of the I/O signals and the 24 V brake control voltage.
  • Note: Common cause of "robot does not move despite Motors On". See also 50362 (axis brake).

Part to check / replace

ABB 37109 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

20252Motor / Thermal sensor / Temperature cable fault20253External device temperature high DRV137001Motor ON contactor activation error

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 →