Code 140-005C: Faulty value for machine parameter
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical Faulty value for machine parameter 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] - Syntax error in the value for a machine parameter in the update rule. - Entered value has a spelling error or in not allowed for the parameter that is to be changed by the update rule. [Error correction] - Check the spelling of the value. - Check the type of value. A numerical value can contain only one number. An enumerated list must be given an existing enumeration name. - 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 140-005C 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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