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Review the NC program at the line where the alarm occurred and check for T0 or missing tool call (T1, T2, etc.).

Verify if T0 is intentional for a non-machining move (rapid positioning, etc.) or if a valid tool number should be programmed.

If a tool should be active, insert the correct tool call (e.g., T1 M6) before the machining operation in the program.

Reset the alarm, restart the program from a safe position, and verify proper tool selection during execution.

Ensure the correct tool is physically in the spindle before running machining operations

Access the tool management screen and verify that all tool offsets and tool data are present and correct.

Check for recent system events (power failure, battery alarm, system reset) that may have cleared tool data.

Reload tool offset data from backup or re-measure and input all required tool geometries and offsets.

Verify all tool length and radius compensations before running production programs

Perform a test run with known good tool data to confirm proper tool selection and offset application.

Review program structure and verify that each subroutine returns with the correct tool state maintained or explicitly called.

Check for any TOOL CALL or T0 commands within subroutines that might unintentionally deselect tools.

Ensure program initialization block includes proper tool selection before any G-code machining moves (G0, G1, G2, G3).

Simulate the complete program in dry run mode and monitor tool changes to identify where T0 is being unexpectedly called.

Use machine lock and feedrate override during simulation to prevent crashes