How the Ice Maker Works on Your Whirlpool Refrigerator

The Ice Maker Runs on Water Pressure and an Electric Valve

Your Whirlpool ice maker does not have its own motor or power source separate from the refrigerator. Instead, it relies on three connected systems: a water inlet valve that opens and closes to let water in, a fill tube that carries that water to the ice mold, and a thermostat or control board that decides when to freeze and when to eject. The valve itself is powered by electricity from the refrigerator's main circuit, and it opens only when the control system sends a signal.

Water pressure from your home's supply line pushes water through the valve and into the mold. Once the mold is full, the valve closes. The freezer's cold air then freezes the water solid over several hours. When the ice is hard enough, a small motor inside the ice maker ejects the cubes into the bin below. Then the cycle starts again.

Key Takeaways

• The ice maker's water inlet valve is an electrically controlled solenoid that opens when the control board signals it, allowing water pressure from your home supply to fill the mold.
• A thermostat or temperature sensor inside the ice maker detects when the water has frozen solid and triggers the ejection cycle.
• A small electric motor powers the ejector arm or tray that pushes finished cubes into the bin.
• If your ice maker stops working, the problem is usually a frozen fill tube, a clogged water filter, a faulty inlet valve, or a tripped control board.
• Your Whirlpool model number determines which parts are inside—check your manual or the model plate on the back wall of the fridge to identify your exact ice maker type.

The Water Inlet Valve: The On-Off Switch for Water

The water inlet valve is a solenoid valve, meaning it uses an electromagnet to open and close. When the ice maker's control board detects that the mold is empty and the freezer is cold enough, it sends an electrical signal to the valve. The electromagnet pulls open a small plunger inside the valve, and water from your home's supply line flows through. The pressure of that water does most of the work—the valve simply gets out of the way.

This valve sits behind your refrigerator, usually near the bottom, and connects to both your home's water line and the fill tube that runs up into the freezer. If the valve fails, water either leaks constantly or does not flow at all. A stuck or frozen fill tube can also block water from reaching the mold, even if the valve opens correctly. On many Whirlpool models, you can hear a quiet click or hum when the valve opens—that is the solenoid engaging.

The Thermostat and Control Board: Timing the Freeze and Thaw

Once water fills the mold, a thermostat or temperature sensor inside the ice maker watches the mold's temperature. On older Whirlpool models, this is a mechanical thermostat with a metal probe that touches the ice. As the ice hardens and the temperature drops, the probe contracts and eventually triggers a switch that tells the ejector motor to run. On newer models, a digital control board uses a thermistor (a temperature-sensitive resistor) to measure the mold temperature and decide when to eject.

The control board also manages the timing of the whole cycle. It waits for the freezer to reach the right temperature before signaling the water valve to fill. It prevents the valve from opening too often, which would waste water and strain the system. If the control board fails, the ice maker may not fill, may fill constantly, or may not eject cubes even after they freeze. Some Whirlpool models have a reset button on the control board itself—check your manual to see if yours does.

The Ejector Motor and Arm: Pushing Cubes Into the Bin

A small electric motor inside the ice maker drives an ejector arm or tray that pushes the frozen cubes out of the mold and into the bin below. This motor runs only when the control board signals it—usually after the thermostat confirms the ice is solid. The motor turns a cam or gear that moves the ejector arm back and forth, dislodging the cubes and sweeping them out.

On some Whirlpool models, the ejector arm is a simple plastic blade that slides back and forth. On others, it is a rotating tray inside the mold itself. Either way, if the motor does not run, cubes stay stuck in the mold and the cycle stops. A jammed ejector arm, a broken gear, or a motor that has burned out will all prevent ejection. You can usually tell if the motor is the problem by opening the ice maker cover and looking for ice cubes still frozen in the mold.

How the Freeze Cycle Timing Works

The entire ice-making cycle on a Whirlpool refrigerator typically takes 90 minutes to 2 hours from fill to ejection, though this varies by model and freezer temperature. Here is the order of events: the control board signals the water valve to open, water fills the mold in about 5 to 10 seconds, the valve closes, and the freezer's cold air begins freezing the water. The thermostat monitors the mold temperature as it drops. Once the ice reaches the target hardness—usually around 15 to 20 degrees Fahrenheit—the thermostat or control board triggers the ejector motor. The motor runs for a few seconds, pushing the cubes into the bin. Then the cycle resets and waits for the bin to empty before filling again.

If your freezer is warmer than normal, the freeze cycle takes longer, and you may get fewer cubes per cycle. If the freezer is very cold, the cycle may complete faster. Some Whirlpool models have a harvest delay feature that prevents the ice maker from running too often—this is built into the control board to save water and energy.

Common Reasons the Ice Maker Stops Working

If your Whirlpool ice maker stops producing cubes, the problem is usually one of these four: a frozen or clogged fill tube, a faulty water inlet valve, a failed control board or thermostat, or a jammed ejector motor. A frozen fill tube is the most common issue, especially if your freezer is very cold or if the tube was not insulated well during installation. You can thaw it by pouring warm water over it or using a hair dryer on low heat.

A clogged water filter is the second most common cause. Whirlpool refrigerators with ice makers have a water filter, usually located inside the fridge or behind the kickplate at the bottom front. If the filter has not been changed in six months or longer, sediment and minerals can block water flow. Replace the filter and see if the ice maker starts working again. If the valve, board, or motor has failed, you will need to order the part and replace it—your Whirlpool manual or the model plate on the back wall will tell you which part number you need.

Checking Your Model Number and Manual

Whirlpool makes several different ice maker designs, and the exact parts and controls vary by model. Your refrigerator's model number is printed on a sticker inside the fridge, usually on the top wall or side wall, or on the back wall of the unit. Write down this number and search for your model's manual online—Whirlpool's website and other appliance manual sites have free PDFs. Your manual will show you a diagram of your ice maker, label the parts, and tell you which components are in your specific model.

The manual also includes troubleshooting steps and part numbers for replacement components. If you need to order a new water inlet valve, control board, or ejector motor, the part number in your manual is the fastest way to find the right one. Some parts are universal across many Whirlpool models, but others are specific to a single design, so always check your manual before ordering.

Frequently Asked Questions

Why does my ice maker make a humming sound but no ice comes out?

A hum usually means the water inlet valve is trying to open but water is not flowing. Check your water filter first—if it is clogged, replace it. If the filter is clean, the fill tube may be frozen or the valve itself may be stuck. Thaw the fill tube with warm water or a hair dryer. If the hum continues and no water flows, the valve has likely failed and needs replacement.

Can I turn off the ice maker without turning off the whole refrigerator?

Yes. Most Whirlpool ice makers have an on-off switch or lever on the side or front of the ice maker itself. Flip it to the off position and the ice maker will stop running. The refrigerator will continue cooling normally. Some models also have a control panel button on the fridge door—check your manual to see which method your model uses.

How often should I replace the water filter on my Whirlpool?

Whirlpool recommends replacing the water filter every six months if you use the ice maker and water dispenser regularly. If you use them less often, you may be able to go longer, but a clogged filter is one of the most common reasons ice makers stop working. Replace it sooner if you notice the ice cubes taste off or the water dispenser slows down.

What does it mean if ice cubes are stuck in the mold and will not eject?

A jammed ejector arm or a failed ejector motor is usually the cause. Open the ice maker cover and look at the mold—if you see cubes that should have been pushed out, the motor or arm is not working. You can manually remove the stuck cubes with a plastic scraper, but the motor or arm will need to be replaced to restore normal operation.

Does the ice maker use a lot of electricity?

No. The ice maker uses power only when the water valve opens and when the ejector motor runs, which is just a few seconds per cycle. Over a full day, an ice maker adds only a small amount to your refrigerator's total power draw. The biggest energy cost is keeping the freezer cold enough to freeze the water, but that happens whether you make ice or not.