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ErrorLib — Industrial Fault Code Library

Disclaimer: ErrorLib is an independent technical reference tool. While we aim for accuracy, always verify with the manufacturer’s official service manuals before performing maintenance on industrial equipment. ErrorLib is not affiliated with the brands listed.

231-A042

CC%2 SOM 4 not released

Heidenhain · TNC CNC Controllers

What does 231-A042 mean?

This error signifies that although operating mode BA4 has been selected via the key switch, it has not been properly released. This prevents the machine from entering or operating in this specific mode.

Common Causes

  • The BA4 operating mode is selected by key switch but has not been released.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Verify that the key switch for operating mode BA4 is correctly selected and actuated.

  2. 2

    Check if there is a specific acknowledgment or release procedure required in the HMI or control panel after selecting BA4.

  3. 3

    Inspect the key switch for any mechanical issues or damage that might prevent proper contact engagement.

  4. 4

    Examine the wiring associated with the key switch for BA4 to ensure continuity and correct connections.

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