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It is normal for some dishwashers to run for up to two hours or more under certain conditions and on certain models. 1  On select models, the timer display or dial will stop for long periods (up to 1/2 hour) during the wash and dry cycles while the heater is activated. On models featuring Auto Hot Start, the cycle may be extended up to 20 minutes while the dishwasher heats the water.
4. Periodically run the dishwasher with vinegar. Place 2 cups of vinegar in the bottom of your dishwasher and run it on low, or the energy-saving setting. Halfway through, stop the dishwasher and let the vinegar soak on the bottom for 15 or 20 minutes.