Code 120-0041: No files available for online help (*.CHM)
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical No files available for online help (*.CHM) 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] No context-sensitive help can be displayed because no files are available for the *.CHM online help. You have to download the *.CHM files from the HEIDENHAIN Homepage and save them on the control in the subfolder for your language. Note the information in the User's Manual. [Error correction] - Download the help files from the HEIDENHAIN homepage (www.heidenhain.de): > www.heidenhain.de > Documentation and information > User's documentation - Unpack the ZIP file and transfer the *.CHM files to the control
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 120-0041 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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