The short answer
On the NLS refrigerators an ice complaint is usually a water-supply or a temperature problem rather than a failed ice maker, and the two are easy to tell apart once you know what to look at. Start by deciding whether water is arriving at all, because everything downstream depends on that answer. Most of this is owner-checkable in a few minutes.
What you observe
- The mould is empty and dry — Nothing has arrived. That points hard at the supply side — the valve, the line, the filter or a shut-off nobody remembers closing.
- The mould is full of water that never freezes — Water is arriving and the compartment is not cold enough to harvest. That is a temperature fault wearing an ice maker costume.
- Cubes are small, hollow or cloudy — A partial fill, usually restriction rather than failure: a clogged filter, a kinked line or a valve that is opening but not fully.
- Cubes fuse into one block in the bin — Slow harvest or repeated part-melting. It means the compartment is drifting warm between cycles even if it feels cold to a hand.
- NEAR MISS — water pools under the unit instead — That is a supply-line or drain leak and it is covered on its own page. Chasing it here wastes an afternoon.
Causes, most likely first on the NLS models
- The compartment is not holding a low enough temperature — The fault that stops ice is the same fault that is quietly costing you cooling everywhere else.
- The water filter is overdue or the supply is restricted — Second, and the cheapest thing on the list. A tired filter starves the fill valve, which gives you small hollow cubes long before it gives you none.
- The fill valve or its line is blocked or frozen — Third: the fill tube is the narrowest point in the whole path and the first place a slow drip freezes solid.
- The ice maker itself has failed — motor, mould heater or the arm — Fourth: it happens, but it is well behind the three above and a shut-off arm knocked up by a bag of peas accounts for a fair share of it.
Check in this order, and why
- Look in the mould: dry, full of water, or partly filled — First, because this one look splits the whole problem into supply, temperature or harvest before you touch anything.
- Check the compartment temperature with a separate thermometer — Second on this build, because the frosting coil that costs you ice is the same one that costs you cooling — find it here and you have found both faults at once.
- Check the filter age and the shut-off valve behind the cabinet — Third: cheap, fast, and it explains small cubes better than anything else on the list.
- Look at the fill tube for a plug of ice and at the shut-off arm — Last of the owner checks, and the one that most often ends the job without a part.
Before you open anything
Safety
Unplug the refrigerator or switch off its breaker before removing any panel — a capacitor can hold a charge after the power is off. Turn the water supply off at the shut-off before disconnecting any line, and never thaw a fill tube with an open flame or a heat gun: the tube and the mould are plastic and the components around them are not rated for it.
When to call a technician
Call once the mould, the filter, the supply and the arm are all clean and there is still no ice. On the NLS models the line is the fill valve: everything upstream of it is owner work, and testing a valve means a meter across a live solenoid, which is not. Call sooner if the compartment cannot reach and hold a safe freezing temperature — that is a cooling fault, it is costing you more than ice, and it is covered on its own page.
