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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-A005

Controller unit not suited for FS

Heidenhain · TNC CNC Controllers

What does 231-A005 mean?

This warning indicates that the control unit (CC, UEC, UMC) is not suitable for control systems requiring functional safety (FS), as detected during a check of the safety kernel software SKERN-CC. The currently installed controller unit fulfills safety requirements according to EN 13849 but is not approved for functional safety applications.

Common Causes

  • The installed controller unit (CC, UEC, UMC) is not approved for functional safety applications.
  • Incorrect controller unit type or version installed for an application requiring functional safety (FS).
  • Mismatched hardware configuration with the safety kernel software (SKERN-CC) requirements.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Verify the part number and type of the installed controller unit (CC, UEC, UMC) against the machine's functional safety requirements.

  2. 2

    Replace the affected controller unit (CC, UEC, UMC) with a model explicitly approved for functional safety (FS).

  3. 3

    Consult the machine documentation or Heidenhain technical support to confirm the correct controller unit required for your system's safety integrity level.

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 455)Search more codes in this manual