The temperature in the refrigeration appliance/freezer zone is too high.
Select a lower temperature.
The ice cube maker is producing only a few, small or deformed ice cubes.
Select a lower temperature.
Remove all food and objects from the area around the ice cube maker.
Check whether the water connection pressure is high enough (depending on the model).
Check whether an incorrect valve has been installed.
Avoid using the dishwasher, washing machine, etc., at the same time.
Check whether the water filter needs to be changed or cleaned.
To make larger ice cubes, increase the amount of water being taken in by the ice cube maker.