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
Verify that the key switch for operating mode BA4 is correctly selected and actuated.
- 2
Check if there is a specific acknowledgment or release procedure required in the HMI or control panel after selecting BA4.
- 3
Inspect the key switch for any mechanical issues or damage that might prevent proper contact engagement.
- 4
Examine the wiring associated with the key switch for BA4 to ensure continuity and correct connections.
Verified technical data. Last updated: March 2026
Related Faults
Source: Heidenhain TNC CNC Controllers