Cause
The unit has met any one or combination of four conditions.
Solution
Thaw the water lines and or the water and componets in the tub.
Check the inlet Hoses
Disconnect the supply hoses from the washing machine and see if water drains out. Also open the faucet and check for water flow. If water is not coming out of the faucet, warm the room and place a warm towel over it and wait 5 to 10 minutes or more for it to thaw.
If the water hose is frozen, you can place it in warm water until it thaws.
If the drain hose is frozen, you can place a warm towel around it or remove it and place it in some warm water to thaw it out.
If you suspect the water in the drain pump is frozen, you can pour warm water into the tub, up to almost the door gasket, and wait approximately 1-2 hours to thaw out then drain manually.