No Cubes
The first thing you should do is make sure you have water at the water valve. If you have water at the valve then check the valve with a ohm meter to make sure it is good. If it checks good then check the water filter. If it tests good then activate the ice maker and check to see if you are getting voltage to the valve change the valve you should be good to go. If you don’t get voltage change the ice maker.
Cubes too small
Change the water valve on the refrigerator.
Leaking water
If you see water on the floor it could be your water dispenser if you see water coming from the dispenser change the water valve. It could be your water valve. If icicles are forming from the ice maker change the water valve.