Code 126-011A: Hardware combination not permitted
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical Hardware combination not permitted 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 detected hardware configuration includes an impermissible combination of CC or PL components. Examples: - CC 6106 and CC 306 - CC 306 and UEC 112 - CC 306 and older PLB, MB, or TE (not "Gen 3 ready" or not "Gen 3 exclusive") [Error correction] - Reconfigure the hardware - Inform your machine tool builder
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 126-011A 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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