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ErrorLib — Industrial Fault Code Library

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231-A096

Spindle drive lock, operating mode is not allowed

Heidenhain · TNC CNC Controllers

What does 231-A096 mean?

This error indicates that a spindle drive was locked. This occurs when an attempt was on a spindle drive while the guard door was open, and the keylock switch was in the 'BA1' position ('unqualified operator'), or due to an internal software error.

Common Causes

  • Attempt to switch on a spindle drive while the guard door was open and the keylock switch was in the 'BA1' position ('unqualified operator').
  • Incorrect keylock switch position for the desired operation.
  • Wiring error related to the keylock switch.
  • Internal software error.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Ensure the guard door is closed before attempting to switch on the spindle drive.

  2. 2

    Check the position of the keylock switch. Select an operating mode that permits spindle operation with or without the guard door open as required by the task and safety regulations.

  3. 3

    Inspect the wiring of the keylock switch for any damage, loose connections, or incorrect terminations.

  4. 4

    Verify the software version of the controller and update it if a known issue related to operating mode interlocks exists.

Browse all codes in this manual (47)
Verified technical data. Last updated: April 2026

Related Faults

231-A001Cancelation of brake-test call monitoring231-A002Cancelation of brake-line-test call monitoring231-A003SPLC commissioning mode active
Source: Heidenhain TNC CNC Controllers
Open Manual (Page 466)Search more codes in this manual