Code 280-0476: Excessive character height
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical Excessive character height 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 programmed engraving with the defined character height Q513 results in a longer text than is defined in Q574. [Error correction] Reduce the character height in Q513 so that the programmed engraving is no longer than defined in Q574. Set the value for Q574 higher or to zero in order to make a longer engraving possible. Enter the value 0 in Q513 if you want to scale the engraving to the text length set in Q574. 10/2023 [899]
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 280-0476 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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