An ice maker is a simple machine at the end of a long chain. Water leaves a pipe in your basement or under the sink, travels through a valve and a thin tube to the back of the refrigerator, passes through a filter, gets metered by an electric fill valve, climbs a small fill tube into the freezer, and freezes in a mold. Then a motor or a twisting tray pushes the cubes out, and the cycle repeats.
Break any link and the bin stays empty. The trick is to walk the chain in order, starting with the parts that cost nothing to check.
Step one: is it switched on?
It sounds too obvious to mention, but it's the most common answer.
- •Wire shutoff arm. On many older-style ice makers, a metal bail arm rises when the bin is full. If it got bumped up while you were digging for a bag of vegetables, production stops. Lower it.
- •Switch or paddle. Many newer ice makers have an on/off switch on the unit or a sensor paddle. Some are controlled from the display panel; check for an "ice off" indicator.
- •Just installed or just moved? A new ice maker can take a day or more before the first batch drops, and the first few batches are often discarded.
Step two: is the freezer cold enough?
The ice maker waits for its mold to reach a set temperature before it harvests. If the freezer is too warm, the cycle drags on or never finishes. Put a thermometer in the freezer near the ice maker. Most manufacturers want the freezer at or near 0°F for normal ice production; your manual gives the exact recommendation.
If the freezer is running warm, that's the problem to fix first, and the ice maker is only a symptom. Our guide to a freezer that won't freeze covers the causes.
Step three: follow the water supply
The valve at the pipe
Find where the refrigerator's water line connects to your plumbing. It is often in the basement ceiling below the kitchen, or under the sink. Make sure the valve is fully open.
If you find a saddle valve (a small clamp bolted around a copper pipe, with a handle that drives a needle through the pipe wall), be aware that these are prone to clogging and slow leaks, and many refrigerator installation guides advise against them. A saddle valve that has partly closed with mineral buildup can let through just enough water to dribble but not enough to fill the mold. Replacing it with a proper shutoff valve is a plumbing job worth doing.
Lines along exterior walls
This is where winter comes in. In older houses, and in some newer ones, the water line to the refrigerator may run along an outside wall, through a cold crawl space, or across an unheated porch or garage. On a hard cold snap, that line can freeze. Signs:
- •Ice production stops during a cold stretch and returns when it warms up
- •The water dispenser stops at the same time
- •The line feels ice-cold where it passes near an exterior wall
A frozen line can split, and you may not find out until it thaws. If you suspect it, shut off the supply valve and have the line checked once it thaws. Rerouting or insulating the run is a plumbing fix that prevents a repeat.
The water filter
A clogged filter restricts flow to both the dispenser and the ice maker. If the dispenser has slowed to a thin stream, the filter is the prime suspect. Replace it according to the manufacturer's schedule, and run water through the dispenser afterward as the manual directs to flush out air.
If your refrigerator has no filter installed, some models need a bypass plug in the filter housing to let water through. Check the manual before running it empty.
Step four: inside the refrigerator
The fill tube
The fill tube carries water from the back of the refrigerator into the ice maker mold. If it freezes, water can't get in. Often you'll see a plug of ice at the tube's outlet above the mold. Common causes are a fill valve that drips slowly between cycles, low water pressure that makes the fill dribble, or a freezer that is set colder than it needs to be.
A hair dryer on low, held at a safe distance, can clear a frozen tube. Keep water and electricity well apart and don't aim heat at plastic parts for long. If it freezes again within a few days, something is feeding it, and that points to the fill valve or pressure.
The fill valve
The electric water valve on the back of the refrigerator opens when the ice maker calls for water. When it fails, it can stay shut (no ice), leak through (a frozen fill tube, or a sheet of ice under the ice maker), or open only weakly. The inlet side has a small screen that can clog with sediment. Testing a valve takes a meter, and it's usually replaced rather than repaired.
The ice maker assembly
The ice maker itself can fail: a stalled motor, a failed thermostat or sensor that never signals "frozen," or a heater that doesn't release the cubes. Clues:
- •Cubes frozen solid in the mold that never get ejected
- •The ejector arms stopped partway through their turn
- •Hollow or very small cubes (usually a water supply issue, not the ice maker)
- •Cubes fused into a block in the bin (often infrequent use, or a freezer that warmed and refroze)
Many ice maker assemblies are replaced as a complete unit.
What you can do safely
- Confirm the ice maker is on and the shutoff arm is down.
- Check the freezer temperature with a thermometer.
- Replace the water filter if it's due, and flush the line.
- Open the supply valve fully.
- Clear a frozen fill tube gently, with the refrigerator unplugged if you're working near wiring.
Before you pull the refrigerator out, turn off the water supply and unplug it. The line at the back is easy to kink or crack.
When to call
Call when the water supply is confirmed good, the freezer is cold, and the ice maker still won't fill or harvest; when you see water leaking under the refrigerator; or when the fill tube keeps refreezing. A technician will test the valve, the ice maker and the controls at your home, explain what failed, and quote the repair before starting.
For more, see our ice maker repair page, then call or book online.