Final answer:
A high temperature dishwasher must reach at least 180 degrees Fahrenheit (82 degrees Celsius) during the final rinse cycle and maintain it for a minimum of 30 seconds for effective sanitation.
Step-by-step explanation:
A high temperature dishwasher on the final rinse cycle must reach a temperature of at least 180 degrees Fahrenheit (82 degrees Celsius) and maintain that temperature for at least 30 seconds to properly sanitize the dishes. This high heat ensures that the majority of pathogens and food residue are eradicated, leaving the dishes clean and safe to use. It is important to ensure that the dishwasher is functioning properly and can reach these temperatures to comply with health and safety standards.