What is an ice maker?

In a freezer, it hides behind a white plastic housing on the upper left wall, with either a wire bail arm hanging into the bin or an infrared beam across it that halts production once ice stacks up. A short fill tube pokes through the back wall above the mold. Water arrives through a 1/4-inch line from a shutoff under the kitchen sink or behind the fridge, usually by way of the door filter. Standalone machines keep everything behind a front grille and drain either by gravity or a small pump.

Production is a timed sequence, so faults land at a specific step. A thermostat watches the mold and, at roughly 15F, starts the ejector motor; a small heater warms the mold just enough to release the cubes; the arm lifts, and the inlet valve then opens for about 7 seconds and doses 4 to 6 ounces of water. Symptoms map straight onto those steps. No water at all points to a frozen fill tube or a dead inlet valve, which needs around 20 psi to open. Small or hollow cubes mean a starved supply, most often a water filter past its 6-month date. Cubes welded into the mold mean a worn ejector gear or a burnt-out mold heater. Walking the sequence is the fastest route when the bin stays empty.

Empty the bin and wash it in warm soapy water every 3 months, because old cubes shrink, fuse together, and take on whatever is uncovered in the freezer. Change the fridge water filter every 6 months, which is the single most common cure for weak ice. On a standalone machine, run a nickel-safe descaler and a sanitizer every 6 months, more often on hard water, and keep the condenser grille clear of lint. The rest of the routine is on the ice maker checklist, and it is the difference between 5 years and 10.