Why is my Sub-Zero making small or hollow ice cubes?

Low water pressure, often from a clogged filter or partially closed valve, is the usual cause. Replacing the filter and checking the supply often fixes it.

Our Mint Hill well water seems to clog the fridge filter quickly. Does that hurt the ice maker?

A clogged filter reduces flow, which leads to small cubes or none at all, and sediment can wear the inlet valve. Change the filter more often if needed, and consider a sediment filter for the house. We can check the valve if production stays low.

The water line to our fridge in an older Matthews home looks brittle. Should it be replaced?

If the line is thin plastic or the saddle valve is old, replacing it is a sensible precaution against leaks. We can connect a new line at the refrigerator. A failing shutoff valve in the wall may need a plumber.

Sub-Zero Repair

Sub-Zero Ice Maker Repair in Matthews & Mint Hill, NC

Sub-Zero ice maker repair in Matthews & Mint Hill, Mecklenburg County. We diagnose first and agree the price before any work.

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Sub-Zero Ice Makers: What We Check First

Sub-Zero ice comes from two very different machines. Most refrigerators and freezers have an automatic ice maker inside the freezer compartment, fed by a water valve and line. Separately, Sub-Zero sells undercounter ice makers that produce clear ice in a dedicated cabinet, often installed in a bar, butler's pantry or outdoor kitchen. Undercounter units need a water supply, a drain, and either gravity drainage or a drain pump.

Clogged water filter or low pressure reducing ice production
Frozen fill line stopping the in-freezer ice maker
Scale buildup on undercounter ice maker evaporators
Drain pump or drain line clog in undercounter installations

The full explanation, including what you can safely check yourself and when repair beats replacement, is in our Sub-Zero ice maker repair guide.

Water Supply Problems Come First

An ice maker needs steady water pressure and a clear path from the shutoff valve to the fill tube. In older homes, the saddle valve or thin plastic line feeding the refrigerator may be decades old, and it can clog, crack or barely open. Homes on private wells can push sediment into the refrigerator filter and inlet valve, and low well pressure produces small or hollow cubes.

A garage refrigerator with an ice maker can also freeze its supply line on the rare hard-freeze nights, while summer heat in the same spot slows production. Garage units also tend to collect dust on their condenser coils, which reduces freezer temperature and slows ice harvests. Cleaning the coils with the unit unplugged is a worthwhile first step.

Checks You Can Make and What We Do

Make sure the ice maker is switched on and the bin is seated. Replace an overdue water filter, and check behind the fridge for a kinked or leaking line. Turn the water off if you see a leak. The technician tests the inlet valve, ice maker module, fill tube and freezer temperature, and explains the repair and price before starting.