Code 220-003F: Program cannot be continued. Selection with GOTO neces-
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical Program cannot be continued. Selection with GOTO neces- 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
sary. [Cause of error] You have called for the program simulation to continue within an NC block. Changed conditions must be applied in order to continue. These can be, for example, a new position for a stop, a changed Q parameter, or a changed condition for the activation of skipped blocks. [Error correction] Starting with RESET+START is possible, as is START after GOTO. As an alternative, perform the stated changes only at a stop at the beginning of an NC block.
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 220-003F 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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