What critical information must be displayed on a dishwasher?

The critical information that must be displayed on a dishwasher is the correct settings. This is essential because dishwashers used in food service must operate at specific temperatures and cycles to ensure that dishware, utensils, and equipment are effectively sanitized and cleaned. Appropriate settings help to eliminate harmful bacteria and ensure compliance with health and safety regulations. Not only does displaying this information help staff operate the dishwasher correctly, but it also aids in maintaining food safety standards, thus protecting consumers.

While other options like cleaning procedures, service history, and manufacturer details have their importance, they do not directly influence the immediate operation and safety of the dishwasher itself as much as the correct settings do. Understanding and utilizing the correct settings is vital for safe food preparation and service.