FIRST, check the water inlet tube for ice (Photos 1 and 2). The tube that supplies water to your icemaker can get plugged with ice when the water pressure is low. The trickling water freezes and plugs the tube before it reaches the icemaker.
SECOND, unblock the saddle valve (Photos 3 and 4). Most icemakers are connected to the household water supply by a “saddle” valve. One problem with saddle valves is that the needle hole in the pipe can clog. Fortunately, that blockage is easy to clear once you locate the saddle valve (Photo 3). If you have an unfinished basement, you’ll probably find a tube beneath the fridge that leads to the valve. Otherwise, look under your kitchen sink.