Code 251-0E37: Trigger condition Signal [SAVED] not fulfilled in current trace
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical Trigger condition Signal [SAVED] not fulfilled in current trace 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 signal state [SAVED] is being used even though no trigger condition has been fulfilled for the current trace. [Error correction] If the signal state [SAVED] is to be used, then a trigger condition must be fulfilled for the current trace. Otherwise the signal curve cannot be associated chronologically.
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 251-0E37 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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