Is it safe to leave a dishwasher in an unheated location during winter, and what precautions should be taken?

You should have a service technician winterize the dishwasher if it will be left in an unheated place. This involves cutting off electrical power, turning off the water supply, draining water from the inlet line and water valve, and using a sponge to soak up water from the rubber boot in the tub bottom. (Page 9)