haier HDT18PA - Manual (Page 17)

You must protect your dishwasher if it is left in an unheated place during the winter.
Preventing Your Dishwasher from Freezing:
You must store the dishwasher at room temperature.
Do not install or operate your dishwasher where the temperature is below
freezing.
If you just got a delivery of a dishwasher when outside temperature is below
freezing, do not operate until dishwasher has warmed to a room temperature.
Storage of Your Dishwasher in Cold Environment:
You must cut off electrical power to the dishwasher.
You must turn off the water supply and disconnect the water inlet line from the
water valve.
You must drain water from the water inlet into the sink or pan.
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