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ErrorLib — Industrial Fault Code Library

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231-A041

CC%2 SOM 4 not possible

Heidenhain · TNC CNC Controllers

What does 231-A041 mean?

This error indicates that Safety Operating Mode (SOM) 4 is not possible for the CC%2 controller. The common causes include Keylock Switch 1 not being in automatic mode (BA1), a defective Keylock Switch 1, or a wiring error.

Common Causes

  • Keylock switch 1 is not in automatic mode (BA1).
  • Keylock switch 1 is defective.
  • Wiring error related to Keylock switch 1.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Set Keylock switch 1 to automatic mode (BA1).

  2. 2

    Test the functionality of Keylock switch 1; verify its different positions and their corresponding electrical signals.

  3. 3

    Inspect the wiring connected to Keylock switch 1 for any breaks, shorts, or loose connections.

  4. 4

    Measure continuity across the contacts of Keylock switch 1 in each position to confirm proper operation.

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 456)Search more codes in this manual