h

Fuse Blowing (Capacitor Module) (ECM)

Fanuc · αi Series AC Servo Motor and Spindle

What does h mean?

The fuse within the Capacitor Module has blown. This indicates an over-current condition or a short circuit within the Capacitor Module. The LED (D2) in the front of a Capacitor Module that the fuse was blown turn off the light.

Repair Steps

  1. 1

    Verify the control voltage (24V) is ON while checking the LED (D2) on the Capacitor Module to confirm the fuse status.

  2. 2

    If the fuse is blown, inspect the Capacitor Module for short circuits or damaged components before replacing the fuse.

  3. 3

    Replace the blown fuse with one of the correct rating.

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Verified technical data. Last updated: March 2026
Source: Fanuc αi Series AC Servo Motor and Spindle