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Locate the active canned cycle block in the program (G73, G74, G76, G81-G89) displayed on the alarm screen or current program position.

Verify the R value (retract/rapid plane) and Z value (hole depth) in the canned cycle block. In absolute mode (G90), R must be greater than Z for downward drilling (e.g., R5.0 Z-10.0 is correct, R-10.0 Z5.0 is wrong).

Check if G90/G91 absolute or incremental mode is active, as this affects how R and Z are interpreted.

Correct the R or Z value so that R point is above the Z depth with adequate clearance (typically 0.1" or 2-5mm minimum).

Reset the alarm (RESET button), return to program start or safe position, and test cycle in single block mode with feed rate override at 0% initially.

Ensure tool is clear of workpiece before restarting program.

Check the current Z-axis position on the position display screen (POS button) and note the machine or workpiece coordinate value.

Compare the current Z position to the R value in the canned cycle. The tool must be at or above the R point before the cycle executes (e.g., if R is Z5.0, tool must be at Z5.0 or higher like Z10.0).

Add a rapid positioning move (G00 Z__ or G00 G28 Z0) before the canned cycle call to position the tool above the R plane with clearance of at least 0.1-0.2" (2-5mm).

Verify tool path in graphics or single block to prevent collisions during added positioning move.

Reset alarm, restart program from the corrected block, and verify the cycle executes properly in single block mode.

Search backward in the program from the alarm point to find the most recent G90 (absolute) or G91 (incremental) modal command. Check the mode display on the control diagnostic screen.

If G91 is active and the canned cycle values were intended as absolute coordinates, insert G90 on the line before the canned cycle block or at the beginning of the drilling routine.

Verify all subsequent moves are compatible with absolute mode; you may need to add G91 back after the canned cycle section.

If G91 must remain active, recalculate R and Z as incremental distances. For example, if tool is at Z10.0 and you want R at Z5.0 and depth at Z-10.0, program R-5.0 Z-20.0 incrementally.

Incremental canned cycles are error-prone; thoroughly verify calculations and test with Z-axis override or dry run.

Reset the alarm, verify the corrected program logic with graphics simulation if available, then test in single block mode with the machine locked (optional lock +Z button) or dry run active.