| Water Inlet Valve |
Your icemaker's water inlet valve could be filled with ice. If it is, simply thaw the its water tube with a hair dryer to remove the blockage. Be careful to not melt any plastic parts with the blow dryer.
An icemaker's water inlet valve has a filtering screen to block minerals and other debris from entering into your ice cubes. It is possible that the water inlet valve's screen is blocked, and not allowing any water through to make ice. Clean out any built up debris you find. You should be able to pop the screen out of place with a screwdriver and then put it back in place with the screwdriver again once it is cleaned.
Alternatively, the water inlet valve itself may have become defective. You will have to test it. If the test proves the valve is defective, replace it.