no water or ice coming from dispencer?

i have a leisure(beko)side by side fridge freezer, model number HJA6100. When the fridge was first connected to the water supply, i tested the dispencer and water came out, but after a few hours we left the fridge to get colder, we got no water. i suspect the water lines are freezing, but what would cause this, the freezer is freezing and the fridge seems to be keeping things cold, any help please, regards m