Code 230-049E: Real time coupling function (RTC) together with handwheel
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical Real time coupling function (RTC) together with handwheel 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
active [Cause of error] - Real time coupling function (RTC) is to be closed while the handwheel is active, or - the handwheel is to be activated while the real time coupling function is active. [Error correction] - Check the NC program and correct it if necessary - Activate the handwheel at a later time - 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 230-049E 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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