Code 231-E007: CC%2 S input not equal 0
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical CC%2 S input not equal 0 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] Error in dynamic test of the 2nd emergency-stop loop. In the dynamic test, O V is expected at all door contacts and key-operated-switch inputs after no later than 1.5 min. If a voltage of 24 V is present here, this error message appears. [Error correction] - Inform your service agency - Check the wiring - Check the door contacts, key-operated switches - Exchange the hardware
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 231-E007 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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