check the Shutoff Arm:
An arm extends away from the ice maker over the ice cube bin. During each ice making cycle, the arm rises up and then drops back down after the new ice is dumped into the ice cube bin. As ice accumulates in the bin it prevents the arm from dropping back down. When the arm is high enough, the ice maker shuts off and no more ice is made until the ice level in the bin drops.
The ice maker can also be turned off manually by lifting the arm all the way up into a locked position (shown below
The arm is supported at one or both ends. One end extends into the back of the front support (see photo above). If it is not securely in place, it could cause the ice maker to malfunction. Confirm that the arm is securely in place.
For proper operation, confirm that arm is in the lowered position and that nothing is blocking it from normal movement.
To test the shutoff function, lift the arm up into the manual shutoff position. Recheck the unit later to confirm that no ice is being made.
If unit continues making ice even when the shutoff arm is in the up (off) position, refer to the diagnostic table or for a modular ice maker, replace the control module.
check the Shutoff Switch:
Before testing the shutoff switch, unplug the refrigerator to avoid an electrical shock hazard.
There are two types of ice makers, those in which all of the parts can be individually replaced and those in which some of the parts are clustered together into a control module. To determine which model you have remove the outer face plate. If there is knob, pull it off first, then pry off the face plate with a small screwdriver.
Modular units have holes in the module's face plate for test probes. If you see several holes, each marked with a letter, it is a modular unit. Component units (like the one shown below) usually have exposed gears and don't have holes for test probes.
Modular units do not use a separate shutoff switch. Instead follow this link to view instructions for checking the shut off arm.