What must happen immediately in a HACCP system when critical limits are not met?

When critical limits are not met in a HACCP system, an immediate corrective action must be implemented to address the deviation. This includes identifying the cause of the failure, taking steps to eliminate the issue, and preventing the affected product from reaching consumers. Additionally, records should be maintained to document the incident and the corrective actions taken. Finally, the HACCP plan may need to be reviewed and modified to prevent future occurrences.