Code 330-00EC: MC: S status reaction is active: %1
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical MC: S status reaction is active: %1 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] An error bit was set in the S status by an internal hardware or software error: -SCC.B.WD: Watchdog WD.B.CC of a CC controller unit has timed out -SMOP.WD: Watchdog WD.A.SMOP or WD.B.SMOP of an MB or TE machine operating panel has timed out -SPL.WD: Watchdog WD.A.SPL or WD.B.SPL of a PLB has timed out -PF.BOARD: The internal voltage monitoring of an HSCI component has detected a faulty supply voltage -REQ.SS2: The internal temperature or fan monitoring of an HSCI component has detected a fault [Error correction] - Generate the service file - 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 330-00EC 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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