SubZero Ice Maker Not Making Ice? Here’s How to Fix It!

April 11, 2024

Sub Zero Ice Maker Not Dispensing Ice? Here's How to Fix It | Sub Zero Certified Repair
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If your SubZero ice maker is not making ice, it can be a frustrating issue, especially in the warmer months or when hosting guests. We’ve compiled a comprehensive guide to help you diagnose and fix the problem, ensuring your ice maker is back in working order as quickly as possible.

1. Clogged or Faulty Water Filter

A water filter clogged or past its service life can significantly reduce the water flow to your ice maker. Over time, the filter can become saturated with impurities, blocking the necessary water flow required for ice production.


  • Identify the Water Filter Location: Typically, in Sub-Zero units, the water filter is located in the upper right corner of the refrigerator compartment.
  • Replace the Water Filter: Twist the old filter counterclockwise to remove it. Please insert the new filter and twist it clockwise until it clicks into place.
  • Reset the Filter Indicator Light: Most models have a reset function for the filter indicator light. Consult your user manual for the exact reset procedure for your model.

Regularly replacing the water filter every six months, or as specified by your model, ensures a consistent flow of clean water to your ice maker.

2. Water Supply Issues

Your ice maker requires a reliable water supply to function. Problems such as kinks in the water line, a closed supply valve, or a frozen water line can disrupt water flow, preventing your SubZero ice maker not making ice.


  • Check the Water Line: Inspect the water line behind your refrigerator. Ensure it is not kinked, twisted, or damaged.
  • Ensure the Supply Valve is Open: The water supply valve, usually located under the sink or behind the refrigerator, must be fully open.
  • Inspect for Frozen Water Lines: If your water line is frozen, turn off the refrigerator and gently heat the line using a warm cloth or hairdryer. Ensure you do this carefully to avoid damaging the line.

Regularly inspect the water line and valve to ensure they are in good condition and functioning correctly.

3. Incorrect Temperature Settings

The temperature settings of your refrigerator and freezer compartments can directly impact ice production. If the freezer is too warm, the ice maker won’t produce ice efficiently.


  • Verify Freezer Temperature: The ideal freezer temperature for ice production is between 0°F (-18°C) and 5°F (-15°C). Use a thermometer to check the internal temperature.
  • Adjust the Temperature Settings: If the temperature is too high, adjust the settings to the recommended range. Wait 24 hours for the temperature to stabilize and check if ice production resumes.
  • Ensure Proper Airflow: Overloading the freezer can restrict airflow, causing uneven temperatures. Rearrange items to allow for adequate air circulation.

Maintaining the correct temperature is crucial for the optimal performance of your ice maker.

4. Faulty Ice Maker Assembly

Components within the ice maker assembly, such as the motor, ejector blades, or sensors, can fail, causing the ice maker to stop working.


  • Inspect the Ice Maker Assembly: Look for visible signs of wear or damage to the motor, gears, and sensors.
  • Test the Ice Maker Functionality: Manually activate the ice maker’s test cycle (consult your manual for specific instructions). If it doesn’t operate correctly, the assembly may need to be replaced.
  • Consider Professional Repair: If you suspect internal components are faulty, it may be best to contact a professional technician like Sub Zero Certified Repair for a thorough diagnosis and repair.

Routine inspection and maintenance of the ice maker assembly can prevent unexpected breakdowns.

5. Blocked or Jammed Ice Maker

Ice can sometimes become stuck in the ice maker or the ice bin, leading to jams that prevent new ice from forming.


  • Clear Any Ice Jams: Carefully remove any ice blockages from the ice maker and bin. Use warm water to melt stubborn ice, but be cautious not to damage plastic components.
  • Check the Ejector Blades: Ensure the ejector blades are not obstructed or frozen. Gently remove any ice buildup around the blades.
  • Regularly Empty the Ice Bin: Overfilling the ice bin can cause jams. Regularly empty the bin to allow continuous ice production.

Regular maintenance and clearing of ice jams help maintain smooth operation.

6. Malfunctioning Ice Maker Switch or Sensor

The ice maker switch and sensors control the production and dispensing of ice. A malfunctioning switch or sensor can halt the ice-making process.


  • Check the Ice Maker Switch: Ensure the ice maker switch is in the “On” position. If it’s off, turn it on and wait to see if ice production resumes.
  • Inspect the Sensors: Clean the sensors with a soft cloth to remove any debris or ice that might be obstructing their function.
  • Test the Ice Maker Switch: Use a multimeter to check if the switch is receiving power. If it’s not, the switch may need replacement.

Routine inspection and cleaning of the switch and sensors can prevent operational issues.

7. Electrical or Control Board Issues

The control board manages all the functions of the ice maker. Electrical issues or faults in the control board can disrupt ice production.


  • Check for Power Issues: Ensure the ice maker is receiving power. Check the outlet and power cord for any issues.
  • Reset the Control Board: Sometimes, resetting the control board can resolve operational problems. Unplug the refrigerator for a few minutes and then plug it back in.
  • Inspect for Burnt or Damaged Components: Look for signs of electrical damage on the control board. If damaged, it may need replacement or a professional Sub Zero Ice Maker Repair Service.

Addressing electrical and control board issues promptly ensures the smooth operation of your ice maker.


By systematically addressing these potential issues, you can effectively troubleshoot and resolve the problem of your SubZero ice maker not making ice. Regular maintenance and prompt attention to minor problems will help keep your ice maker running smoothly for years to come.

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