A fluid delivery system is provided for delivering fluid to a patient. The system comprises a reservoir for storing the fluid to be delivered to the patient and a fluid discharge device operatively coupled to the reservoir for delivering the fluid from the reservoir to the patient. A controller is configured to operate the fluid discharge device. An input device is in electronic communication with the controller and configured for setting at least one operating parameter of the system. The controller operates the fluid discharge device based on the at least one operating parameter and locks the system after the at least one operating parameter is set such that the at least one operating parameter is unable to be modified. A display is in electronic communication with the controller to at least periodically display a code for resetting the at least one operating parameter. The code is altered at least once during use. The controller is further configured to unlock the system upon receiving the code thereby allowing a user to reset the at least one operating parameter.