You need to run a check on your water inlet valve and the defrost thermostat.
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.
Before you begin to test your
icemaker's water inlet valve, make sure you disconnect the appliance's power
the test you conduct with your icemaker water inlet valve does not produce
these results, then you should replace the component.
your icemaker's water inlet valve, it is typically located behind a
refrigerator. Gently pull your refrigerator away from the wall. You may
want to place scraps of carpet, of some other soft material below the
fridge to prevent damage to the floor. Turn of the water valve's water
supply by closing the shut-off valve in the waterline leading to the water
valve. Remove the lower access panel on the back of the refrigerator using
a screwdriver or a nut driver.
a container under the valve to catch any water that may spill from the
water valve and its fill tube. Remove the water valve's fill tubing.
Loosen the flare nut on the brass fitting that is found on the inlet side
of the water valve. You can use a wrench to loosen the flare nut.
water inlet valve is held in place on your refrigerator by means of a
metal bracket. Use a screwdriver or a nut driver to remove the screw that
holds the water valve's bracket to the refrigerator cabinet. Gently pull
the water valve out of the cabinet, and remove the tube from the outlet
are two wires connecting to the terminals of your water inlet valve. If
yours is a double solenoid water valve, it will have four wires. Be sure
to label each wire so that you know where to reconnect them later. Firmly
grasp the metal connector of the wires in order to remove the wires. You
may need to use a pair of needle-nosed pliers. Do not pull on the wires
your multi-tester to the R X 1 ohms setting to test for continuity. Place
each of the multi-tester's leads on a terminal. Your multi-tester should
display a reading between 200 and 500 ohms. Closely examine your water
inlet valve. The exact ohm resistance rating you should test for may be
marked on the valve.
To test you defrost thermostat http://www.fixya.com/support/r10513592-test_defrost_thermostat
To replace it: http://www.fixya.com/support/r10513650-replace_defrost_thermostat
If both have been tested and you found out the problem is not from either of them, then i will advice you replace the ice maker mechanism.
Hope this helped.
All the best