Code 330-0038: Axis not at test position
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical Axis not at test position 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] - The axis to be tested is not located at the test position (safe machine parameter positionMatch in CfgAxisSafety). - The axis to be tested is not located at the test position (safe machine parameter positionDiffRef in CfgAxisSafety). - Axis traverse direction is not correctly configured (machine parameter MP_signCorrActualVal, MP_signCorrNominalVal or entry in the DIR column of the motor table). [Error correction] - Press CE to acknowledge the error message and move the axis to the test position. - Then test the axis. - If the message appears although the axis is at the correct test position, check the configuration of the axis traverse direction and correct it if necessary. - Inform your service agency
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 330-0038 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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