How do I winterize or store the dishwasher when not in use?

To store the dishwasher during summer, turn off the water supply and power supply to the unit. If the dishwasher is located in a seasonal dwelling or could be exposed to near-freezing temperatures, have it winterized by authorized service personnel to protect against water damage from freezing lines. The warranty does not cover ruptures caused by freezing.

From the official Whirlpool W10021620 Built-In Dishwasher manual, page 17

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