Check the amount of water supplied to the ice tray.
Lift up the icemaker bucket and gently pull out of the freezer.
When you press the Test button for 3 seconds, the ice cube container is filled with water from the water supply tap after ice tray is twisted. Check to make sure the amount of water is correct(see the illustration below).
If the water level is too low, the ice cubes will be small. This is a water pressure problem from with in the main water pipes, not the refrigerator.