--- title: "Whirlpool Undercounter Ice Maker Troubleshooting" canonical: "https://gadgetguides.org/whirlpool-undercounter-ice-maker-troubleshooting/" author: "Arian" published: "2026-09-12T22:39:16+00:00" modified: "2026-09-12T22:39:16+00:00" language: "en-US" site: "Gadget Guides" description: "Your Whirlpool undercounter ice maker is supposed to be the hero of your home bar. It sits there quietly, cranking out cubes so you never have to wrestle…" categories: "Help Guide" attribution: "Gadget Guides (https://gadgetguides.org/)" --- # Whirlpool Undercounter Ice Maker Troubleshooting Your Whirlpool undercounter ice maker is supposed to be the hero of your home bar. It sits there quietly, cranking out cubes so you never have to wrestle with a plastic tray again. That is, until it stops working. Whirlpool undercounter ice maker troubleshooting doesn't have to mean a service call. Most common failures are simple to diagnose yourself in under an hour. Manufacturer specs say these units produce 50 to 100 pounds of ice per day depending on the model, and each freeze cycle takes 15 to 20 minutes. When those numbers stop lining up, this guide walks you through the fixes. ![Whirlpool Undercounter Ice Maker Troubleshooting](https://gadgetguides.org/wp-content/uploads/2026/09/whirlpool-undercounter-ice-maker-troubleshooting-mtyyw0ui.webp) Image source: Bing (Web (fair-use with source credit)) ## Quick Answer: What Your Ice Maker Is Trying to Tell You Start with the basics. Check that the unit is plugged in and the circuit breaker hasn't tripped. Confirm the water supply shutoff valve is fully open. Then press and hold the On/Off button for 10 seconds to reset the control board. If the unit still won't make ice, use the symptom table below to jump to the right section. | Symptom | Likely Cause | First Move | | --- | --- | --- | | No ice at all | Power, water shutoff, or locked control board | Hard reset, check water valve | | Small or hollow cubes | Cold water, thickness sensor, low water flow | Adjust sensor, check filter | | Runs constantly | Bin full sensor failure or stuck harvest | Clear sensor arm, reset unit | | Water pooling inside | Drain pump failure or drain clog | Clean and test drain pump | | Flashing light or code | Sensor alert or dirty unit | Check owner's manual, run clean cycle | ## No Ice at All: Water Supply, Power, and the Reset Sequence The most common complaint is also the simplest one. Your Whirlpool ice maker hums, the fan spins, but the bin stays empty. Work through these checks in order. ### Is the water supply turned on? This sounds too obvious, but it causes more dead ice makers than any other issue. If you recently moved the unit, pulled it out for cleaning, or had plumbing work done, someone may have shut the valve off. Follow the water line back to the shutoff under the sink. It should be turned fully counterclockwise. A partially open valve can feed enough water to avoid an error code, but not enough to fill the ice mold. ### Is the unit getting power? Check the outlet with a lamp or phone charger. If the outlet is on a GFCI circuit, look for a tripped breaker. A GFCI can cut power without flipping your main panel. Press the test button firmly until it clicks back in. ### Run the hard reset sequence Whirlpool control boards can lock up just like a laptop. Here's the fix. 1. Press and hold the On/Off button for 10 seconds. The display should flash and go dark. 2. Wait 60 seconds with the unit completely off. This drains residual power from the board. 3. Press the On/Off button once to restart. 4. Wait 15 minutes without opening the door. If ice appears in the mold after 15 minutes, the reset worked. If not, move on to the water inlet valve. ### Test the water inlet valve ![water inlet valve](https://gadgetguides.org/wp-content/uploads/2026/09/water-inlet-valve-mtyyw2tr.webp) Image source: Bing (Web (fair-use with source credit)) The water inlet valve is a small solenoid that opens to fill the ice mold. When it fails, you get zero water and zero ice. Unplug the unit. Locate the valve on the back. It's a small metal or plastic block with a water line on one side and two wire terminals on the other. Disconnect the water line and check the screen for debris or mineral buildup. A clogged screen can stop ice production completely. Then test the solenoid with a multimeter set to ohms. Touch one probe to each terminal. A working valve reads between 200 and 500 ohms. If you get infinite resistance, the coil is burned out and the valve needs replacement. ### Check for a frozen water line This one sneaks up on people in winter. If the unit is in a garage, basement, or unheated space, the water line can freeze even when the room feels okay. Pull the unit out and feel the line along its full length. A frozen section feels rigid and cold. A hair dryer on low heat will usually thaw it in five minutes. Never use a heat gun or open flame. ## Ice Is Too Small, Hollow, or Misshapen: Temperature, Thickness Sensor, and Water Flow Small or hollow cubes are frustrating because the unit looks like it's working. It runs, it harvests, it drops ice. But the cubes come out shrunken. This usually points to one of three problems. ### Incoming water is too cold Whirlpool undercounter ice makers expect incoming water between 40 and 90 degrees Fahrenheit. The ideal range is 50 to 70 degrees. If the water dips below 40, the mold freezes too slowly and the cubes end up small or hollow in the center. This is common during winter when groundwater temperatures drop. Run a few cycles and see if cube size improves as the line warms up. If not, insulate the water line. ### Ice thickness sensor is out of calibration Whirlpool units use a small probe or paddle to measure ice thickness. When the ice hits the right depth, the sensor triggers the harvest cycle. If it triggers too early, you get thin, hollow cubes. Look for a small adjustment screw on the sensor assembly. It's usually behind the front panel or inside the bin area. Turn it clockwise to increase cube thickness. Go a quarter turn at a time, then let the unit run three full cycles before checking. ### Water flow is restricted A partially clogged water filter, a kinked supply line, or mineral buildup in the inlet valve can fill the mold only halfway. The unit freezes whatever water gets in. That gives you small, irregular cubes. Check the water filter first. If your unit has a bypass plug, install it temporarily to rule out a clogged filter. No filter? Check the supply line for kinks and inspect the inlet valve screen as described earlier. ## Ice Maker Runs Constantly and Won't Shut Off: Bin Full Sensor and Harvest Cycle Issues A Whirlpool ice maker that never stops is more than annoying. It dumps ice on top of ice, jams the auger, and can damage the gear train. The root cause is almost always one of two things: a failed bin full sensor or a stuck harvest cycle. ### Bin full sensor failure The bin full sensor is a mechanical arm or optical sensor near the top of the storage bin. When ice reaches the sensor, it trips and tells the control board to stop production. If the sensor gets stuck in the "empty" position, the unit keeps making ice forever. For a mechanical arm, clear any ice buildup around the pivot point. It should swing freely. For an optical sensor, wipe the lens with a soft cloth and a little isopropyl alcohol. Mineral film can block the beam and trick the board. If cleaning doesn't help, test the sensor with a multimeter. With the bin empty, the circuit should show continuity. Block the sensor manually and the circuit should open. If it doesn't, replace the sensor. ### Stuck in the harvest cycle Sometimes the water freezes, but the cubes won't release. The harvest heater warms the mold, and the ejector arm pushes the cubes out. If the heater or ejector fails, the unit gets stuck trying to harvest the same batch over and over. You'll hear the unit running and maybe a click, but no ice drops. Open the door and look at the mold. If you see cubes stuck to the mold, unplug the unit and let them soften for a few minutes. Gently free them by hand. Never force the ejector arm. If the arm still feels stiff after the ice is clear, the gear train inside the harvest motor may be stripped. ### Control board ghosting On older units, the control board can simply forget to stop. A hard reset usually clears this. If the problem returns within a week, the control board relay has likely failed and the board needs replacement. ## Water Leaking or Pooling Inside: Drain Pump, Leveling, and Water Line Checks Water pooling inside your ice maker is stressful. The good news is that internal leaks are usually fixable without a technician. The bad news is that ignoring them can ruin your cabinetry and flooring. ### Drain pump failure on pump-equipped models Many Whirlpool undercounter units use a small pump to push water from the sump up to the drain line. When the pump fails, water collects in the bottom and overflows into the cabinet. ![drain pump](https://gadgetguides.org/wp-content/uploads/2026/09/drain-pump-mtyyw4cj.webp) Image source: Bing (Web (fair-use with source credit)) Listen for the pump during a drain cycle. You should hear a distinct hum for 15 to 30 seconds after the ice drops. If you hear a hum but no water movement, the impeller may be jammed with debris. Unplug the unit, remove the pump access panel, and check the impeller chamber for ice shards or mineral deposits. If the pump is silent, it may be dead. Test the terminals with a multimeter. No continuity means a burned-out motor. Replacement pumps cost 40 to 80 dollars and take about 30 minutes to install. ### Gravity drain clog Gravity-drain models rely on a sloped line to carry water away. A clog backs water up into the unit. Pour a cup of warm water down the drain opening. If it pools instead of draining, the line is blocked. Disconnect the drain line at the back and clear it with a flexible brush or compressed air. ### Unit not level Whirlpool undercounter ice makers need to be level side to side, with a slight backward tilt of about 1/8 inch per foot. This tilt makes sure water runs toward the drain instead of pooling under the mold. Place a carpenter's level on top of the unit and adjust the front leveling legs. ### Loose water line connection A loose compression fitting can drip slowly. Check the water line connection at the back of the unit. Tighten the fitting gently with a wrench. Overtightening can crack the plastic, so use a light hand. ## Whirlpool Error Codes and Flashing Lights: What They Mean and How to Clear Them Newer Whirlpool undercounter models use indicator lights and digital displays to communicate problems. The exact code patterns vary by model line. You'll find the full diagnostic table in your owner's manual, but some patterns repeat across the lineup. ### Flashing "ICE" light A blinking "ICE" status light usually means the control board has paused production. The two most common triggers are a full bin and a low water condition. Clear ice around the sensor first. Then check the water supply and run a hard reset. If the light still blinks, the bin full sensor may need replacement. ### Flashing "CLn" or cleaning reminder Some self-cleaning models flash "CLn" when the unit has completed a certain number of cycles. That's your cue to run the built-in cleaning cycle. Use an approved ice machine cleaner or a vinegar and water solution. The cycle typically takes 20 to 30 minutes and flushes the system line by line. ### No display, but unit runs poorly If there's no error code but behavior is still off, the control board is likely in a glitch state. Unplug the unit for five full minutes. This is different from pressing the On/Off button. A full power pull drains the board completely and clears most soft faults. For the exact code table for your specific model, check [Whirlpool's official support page](https://www.whirlpool.com). You'll want the owner's manual for your serial number, since codes changed between model generations. ## Preventative Maintenance That Actually Prevents Problems Most Whirlpool ice maker failures are preventable. A few minutes of maintenance every six months keeps the machine running strong and avoids the most expensive repairs. ### Clean the condenser coils The condenser coils pull heat out of the unit. When they get coated in dust or pet hair, the compressor works harder, freeze cycles slow down, and ice production drops. The coils are usually behind a grille at the front or back of the unit. Vacuum them every six months. As of 2026, this single habit prevents more service calls than any other maintenance step. ### Run the self-clean cycle Hard water leaves mineral scale on the mold, in the water lines, and on the thickness sensor. That scale wrecks ice quality and confuses the electronics. Run the cleaning cycle every six months, or every three months if you have hard water. Use a commercial ice machine cleaner and follow the dilution ratio on the bottle. ### Replace the water filter on schedule If your unit uses a water filter, replace it at least every six months. A clogged filter restricts water flow and creates small or hollow cubes. Mark your calendar. The filter is cheap. The frustration of an underperforming ice maker isn't. ### Keep the bin sensor clear Wipe down the bin full sensor arm and the optical lens every time you empty the bin. This takes two seconds and prevents the "runs forever" failure before it starts. ### Level the unit twice a year Slab floors settle. Cabinets shift. Vibrations walk the unit out of level. Check the leveling every six months and adjust the front feet as needed. This protects the drain system and keeps water moving where it belongs. ## Frequently Asked Questions ### Why isn't my Whirlpool undercounter ice maker making ice? Check the basics first. Make sure the unit is plugged in, the water shutoff is open, and the bin full sensor isn't blocked. Then hold the On/Off button for 10 seconds to reset the control board. If ice still doesn't form after 15 minutes, inspect the water inlet valve with a multimeter. ### How do I reset my Whirlpool ice maker? Press and hold the On/Off button for 10 seconds until the display flashes. Wait 60 seconds with the unit off, then press the button once to restart. For a deeper reset, unplug the unit for five minutes and plug it back in. ### Why are the ice cubes small and hollow? Small or hollow cubes usually mean the ice thickness sensor is triggering harvest too early. Turn the adjustment screw a quarter turn clockwise to increase cube size. Also check incoming water temperature. Water below 40 degrees Fahrenheit causes poor ice formation. ### Why does my ice maker keep running and overflowing? The bin full sensor is the most likely culprit. Clear ice and debris from the mechanical arm or optical lens. If the sensor still fails to trip, test it with a multimeter. A stuck sensor keeps producing ice because the board never gets the "full" signal. ### How long does a Whirlpool undercounter ice maker last? With regular maintenance, most units last 5 to 10 years. Cleaning the condenser coils, running the self-clean cycle, and replacing the water filter on schedule are the main ways to extend that life. Hard water and infrequent cleaning are the leading causes of early failure.