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Identify the block number where the alarm occurred from the control display and locate the corresponding line in the part program.

Verify all required parameters for the specific G-code cycle are present: R (retract plane), Z (depth), F (feedrate), and cycle-specific values like Q (peck depth for G83) or P (dwell time for G82/G89).

Check that F (feedrate) is programmed and greater than zero. Verify Z-depth and R-plane values are logical (Z-depth should be deeper than R-plane in absolute coordinates).

Correct any missing or invalid parameters, re-upload or re-enter the program, reset the alarm, and return to the start of the cycle to re-execute.

Review the program preceding the canned cycle to confirm the correct plane selection modal code is active (G17 for XY/Z-axis, G18 for ZX/Y-axis, G19 for YZ/X-axis).

Verify that the drilling axis corresponds to the selected plane (Z-axis for G17, Y-axis for G18, X-axis for G19).

Check for inadvertent plane changes earlier in the program or from a previous operation that may still be modal.

Correct the plane selection code or rearrange axis assignments to match the intended machining operation, then restart the program from a safe position.

Check if multiple canned cycle G-codes are programmed in the same block or if a canned cycle is called while another is already active without first issuing G80 (cancel canned cycle).

Verify that motion commands (G00/G01) are not mixed with canned cycle initiation in the same block, as this can cause parsing errors on some Fanuc controls.

Review parameter settings related to canned cycles (particularly parameters 5101-5149) to ensure they have not been altered from factory defaults or application-specific requirements.

Changing Fanuc parameters can affect machine operation. Document original values before making changes.

Insert G80 to cancel any active canned cycle before starting a new one, separate incompatible commands into individual blocks, and re-run the program.