Code 231-8A40: Enabling of axis group %1
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical Enabling of axis group %1 alarm. Immediate attention from a qualified operator or maintenance technician is required to prevent secondary damage to the equipment or spoiled parts during the manufacturing cycle. Always ensure standard safety and LOTO procedures are followed before accessing electrical cabinets.
Official Troubleshooting Steps
[Cause of error] - Because of missing drive enabling for axis groups (X150/ X151), the drive cannot be switched on. [Error correction] - Inform your service agency - Check the connector on X150/X151 for correct fit - Check the wiring of X150/X151 - Check the optional configuration datum driveOffGroup. 10/2023 [421]
Source: HEIDENHAIN NC Error Messages — TNC7/640/620/320/128, CNC PILOT 640, MANUALplus 620 (10/2023)
Last reviewed: 2026-07-01 · Verified against the manufacturer’s official documentation.
About Heidenhain TNC Series CNC Alarms
Heidenhain controllers include extensive self-diagnostics that flag or halt the machine when a fault is detected. Error code 231-8A40 on the TNC Series CNC identifies one specific fault condition — its documented cause and the official corrective steps are listed above, sourced from Heidenhain's service documentation. Always confirm against the manual for your exact machine configuration and follow LOTO procedures before servicing.
Complete Alarm List: 4497 Heidenhain TNC Series CNC codes.
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