Code 280-0475: Character height not defined
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical Character height not defined 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 transfer value in the input parameters Q513 “Character height” and Q574 “Text length” is 0. [Error correction] In the input parameter Q513, define the desired character height. In the input parameter Q574, define the maximum permissible text length. Define the value 0 for character height in Q513 if you want to scale the engraving to the value defined for text length in Q574.
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 280-0475 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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