Code 330-0003: External EMERGENCY STOP
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical External EMERGENCY STOP 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 PLC input for the control-is-ready signal is inactive - The EMERGENCY STOP circuit was interrupted manually or by the control. [Error correction] - Enable the EMERGENCY STOP button, switch on the control voltage, and acknowledge the error message. - Check the EMERGENCY-STOP circuit. (EMERGENCY STOP button, axis limit switches, wiring, etc.)
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 330-0003 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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