Code 120-001E: Can't connect to network: %1 %2 %3
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical Can't connect to network: %1 %2 %3 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] Unable to connect with a network drive defined in the network management. [Error correction] - Use the program manager to open the network management (NETWORK soft key) - Press the MOD key and enter the network code number NET123. - Enter all required data for the network connection (DEFINE NETWORK CONNECTN. soft key). - Check the correctness and spelling of the input data for the network connection
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 120-001E 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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