Why your ice maker makes small, hollow or cloudy ice

Small, hollow or cloudy ice is a different problem from no ice at all. The ice maker is cycling, so the motor and controls are working. What’s wrong is the water going in, the temperature it freezes at, or the way it freezes.

Here’s how to tell which one you’re dealing with.

Quick diagnosis by symptom

What you see	Most likely cause	Start here
Small or thin cubes	Not enough water per fill	Supply valve, filter, line, pressure
Hollow cubes or shells	Short fill, or harvesting before fully frozen	Water flow, then freezer temperature
Cubes joined by thin “tails”	Overfill or dripping valve	Inlet valve, level of the refrigerator
Cloudy or white centers	Air and minerals trapped while freezing	Usually normal
Bad taste or smell	Old filter, absorbed odors, stale ice	Filter, bin, freezer contents
White flakes in melted ice	Minerals in the water	Water source, machine descaling

Small or hollow ice cubes

Each time the ice maker fills, the inlet valve opens for a set number of seconds. If water flows slowly during that window, the mold gets only part of a fill and you get small cubes. Fix the flow and the cubes usually return to normal size within a day.

Check the water flow, step by step

1. Time the dispenser. If your refrigerator has a water dispenser, fill a measuring cup and compare the flow with what the manual says. A weak dispenser almost always means a weak ice maker fill.
2. Replace an old filter. Sediment slowly closes off a filter, and the ice maker feels it first. If the filter is past its date, swap it and flush several gallons through the dispenser.
3. Open the supply valve fully. A valve left partly closed after plumbing work is a common find.
4. Look for kinks behind the refrigerator. Unplug it before pulling it out, and move it slowly.
5. Consider reverse osmosis. RO systems often deliver lower pressure than a direct line, especially when the storage tank is drawn down after heavy use. If your cubes shrink after someone runs a lot of filtered water at the sink, that’s a strong hint.
6. Suspect the inlet valve screen. The water inlet valve has a small screen at its inlet that catches sediment. When it clogs, flow drops even though everything upstream is fine. Cleaning or replacing it means working at the back of the refrigerator with the water off and the power disconnected.

Some older mechanical ice makers have a fill adjustment screw. Turning it up can make up for a slightly weak supply, but it rarely fixes the real cause, and too much water leads to spills and clumped cubes. Most modern ice makers don’t have one.

When hollow cubes point to temperature

If water flow is good and you still get hollow shells, the ice maker may be harvesting before the cubes freeze through. That happens when the freezer is running warm. Check it with a thermometer in a glass of water overnight. If it reads well above 0°F, start with our guide to a freezer not freezing before worrying about the ice maker.

Lopsided cubes and tails

A refrigerator that’s out of level tilts the ice mold, so one end overfills and the other comes up short. Check side to side with a level on a freezer shelf. Thin tails of ice linking cubes together, on the other hand, usually come from a valve that keeps dripping after the fill ends.

Cloudy ice versus clear ice

Refrigerator ice makers freeze a whole mold of still water at once. Freezing starts at the outside surfaces and works inward, pushing dissolved air and minerals toward the center, where they get trapped. That’s the white core you see in most cubes. It’s normal, and no setting will change it much.

Clear-ice machines work on a different principle. They freeze water in thin layers on a chilled plate or grid while water keeps flowing over it. Air and minerals stay in the moving water instead of getting locked into the ice, which is why the cubes come out glass-clear.

So if a standard ice maker makes cloudy ice, that’s expected. If a clear-ice machine starts making cloudy ice, something has changed. The usual reasons are scale on the evaporator, a machine that’s overdue for cleaning, or water that’s higher in minerals than it used to be.

Ice that tastes or smells bad

Ice is very good at absorbing odors. Work through these in order:

1. Dump the bin. Ice that has sat for weeks picks up freezer smells and can taste stale. Wash the bin in warm, soapy water, rinse well and dry it before putting it back.
2. Clear out odor sources. Open containers, freezer-burned meat and spilled food all end up in the taste of your ice. Wrap or toss them, and wipe down the freezer.
3. Change the filter. A filter past its life stops removing chlorine and other taste compounds. A brand-new filter can release carbon fines, so flush it as the manual directs.
4. Taste the water. Run a glass from the dispenser or the line feeding it. If the water tastes off, the problem is the water, not the ice maker.
5. Give a new water line time. A plastic taste after a new installation often fades after a few days of use.

If ice tastes fine but smells musty, look for mold in the dispenser chute or the bin area, especially on door-dispenser models.

Cleaning standalone clear-ice makers

Undercounter clear-ice machines need regular cleaning to keep making clear ice. Scale builds up on the evaporator, slime can grow in the water reservoir and lines, and ice stops releasing cleanly. The owner’s manual will give a cleaning interval and a cleaning cycle you start from the control panel.

Use the cleaner the manufacturer specifies. Many call for a nickel-safe ice machine cleaner, because the plated evaporator can be damaged by the wrong product, so don’t substitute vinegar or a household descaler unless the manual says it’s acceptable. Run a full rinse cycle afterward and throw out the first batch of ice.

Water hardness around Puget Sound

Seattle and Tacoma both draw municipal water from mountain sources that are relatively soft, so scale tends to build more slowly here than in hard-water regions. That doesn’t mean it never builds. It just means the cleaning schedule in your manual is usually enough.

Private wells are another story. Well water on parts of the Kitsap and Key peninsulas, and around Fox Island and Gig Harbor, can be noticeably harder. If you’re on a well, test your water hardness, and expect to clean a clear-ice machine more often than the minimum the manual suggests.

When to call a technician

Call for service if:

• Water flow to the dispenser is strong but cubes are still small or hollow.
• The ice maker keeps overfilling, spilling or forming tails after you’ve checked the level.
• You hear the inlet valve buzzing, or see water dripping into the mold between cycles.
• A clear-ice machine still makes cloudy or thin ice after a full cleaning cycle.
• The freezer won’t stay near 0°F.

If the ice maker has stopped producing entirely, see ice maker not making ice. Our ice maker repair page covers refrigerator ice makers and undercounter machines.