Complete Troubleshooting Guide for a Sub-Zero Ice Maker Not Working Properly


Is your Sub-Zero ice maker not working as it should? This guide is here to assist you. Even high-end Sub-Zero refrigerators occasionally develop issues with their ice makers, but with a little understanding and effort, most of these problems can be resolved. We’re going to explore common issues such as the Sub-Zero ice maker not making ice, overflowing, leaking water, or producing bad-tasting ice. For each issue, we’ll provide in-depth analysis, solutions, and preventative measures. Let’s get started!

Why Is My Sub-Zero Ice Maker Not Working Correctly?

1. Sub-Zero Ice Maker Not Making Ice

When your Sub-Zero ice maker is not making ice, it can be a source of great frustration, especially during those hot summer days when a chilled drink is a must. The cause can vary from a minor issue that requires a small adjustment, to something more serious that may need component replacement. Let’s break it down:


  • Faulty water inlet valve: This is an electrically-controlled valve that opens to supply water into your ice maker. If it malfunctions or fails to open due to an electrical fault, water cannot reach your ice maker to form ice.
  • Frozen water line: The water line carries water from the water source into your ice maker. If this line freezes, it blocks the water supply, preventing the ice maker from producing ice.
  • Problematic control module: The control module manages the various functions of the ice maker. If this part is malfunctioning, it can hinder the overall ice-making process.
  • Clogged or expired water filter: The water filter cleans the water before it reaches the ice maker. A clogged or expired filter can reduce or stop the water flow, affecting the ice production.


Here’s how you can tackle these issues:

  1. Check if the ice maker is on: Look for an indicator on the control panel that signifies the ice maker is working. If you don’t see an indicator, you might be wondering, “how do I turn on the ice maker on my Sub-Zero refrigerator?” Refer to your user manual for step-by-step instructions.
  2. Inspect the water inlet valve: Test the water inlet valve using a multimeter for continuity. If it lacks continuity, it means the valve is defective and needs to be replaced.
  3. Examine the water line: If it’s frozen, gently thaw the ice blocking the line using a hairdryer. Be careful not to apply too much heat, as this can risk melting the line.
  4. Check the control module: This involves inspecting the module for any signs of damage. If it’s not ejecting ice or seems unresponsive, you might need to replace it.
  5. Replace the water filter: If your Sub-Zero water filter is clogged or expired, it’s time to replace it. Regular replacement of the water filter can ensure a steady flow of water to the ice maker and better tasting ice.

replacing a sub zero water filter

2. Sub-Zero Ice Maker Overflowing

An overflowing ice maker can be a nightmare to deal with, leading to water leakage and possibly even damage to your kitchen floor. Here’s a deeper look at what might be causing this issue:


  • Faulty ice maker control: The ice maker control detects the level of ice in the bin and manages the ice production accordingly. If it’s malfunctioning, it might not accurately detect the ice level, causing the ice maker to produce more ice than necessary.
  • Malfunctioning water inlet valve: If this valve doesn’t close properly after the required amount of water has been supplied, it could lead to an overflow of water, making the ice maker seem like it’s overflowing.


Here’s how you can fix these problems:

  1. Adjust or replace the ice maker control: Inspect the control to see if it’s functioning properly. If it’s not, you might need to replace it. In some cases, it might just need a minor adjustment in the settings.
  2. Examine the water inlet valve: Test the valve to see if it’s closing completely after the ice maker is filled. If it isn’t, you may need to replace it to prevent overfilling and subsequent overflowing.

3. Sub-Zero Ice Maker Leaking Water

There’s nothing worse than discovering a puddle of water under your Sub-Zero refrigerator. A leaky ice maker can lead to slippery floors and potential water damage. Let’s take a closer look at why this might be happening:


  • Clogged defrost drain: The defrost drain allows the water from the defrost cycle to exit the refrigerator. If this drain is blocked, water can start to build up and leak out of the refrigerator.
  • Leaking water filter: The water filter is vital for ensuring clean, fresh-tasting ice. However, if it’s leaking, it can cause a pool of water to form at the base of your refrigerator.


  1. Clear the defrost drain: You can flush the defrost drain with warm water to clear any obstructions. This should help the water flow freely once again.
  2. Replace the water filter: If you notice your Sub-Zero water filter leaking, replacing it with a new one should solve the problem. Regular maintenance and timely replacement of the water filter can prevent such issues.

4. Sub-Zero Refrigerator Ice Tastes Bad

Nothing ruins a refreshing drink faster than bad-tasting ice. This issue may have nothing to do with your ice maker’s functionality, but it still impacts the quality of your ice. Here’s what could be causing the problem:


  • Stale or contaminated water: If your water supply is not clean, it can affect the taste of your ice. Stale or contaminated water is often the culprit behind bad-tasting ice.
  • Dirty ice bin: If your ice bin is not clean, the residues and odors can contaminate your ice and affect its taste.
  • Faulty water filter: If your filter is damaged or expired, it may fail to filter out impurities effectively, which can affect the taste of your ice.


To improve the taste of your ice:

  1. Check your water supply: If your tap water has a bad taste or odor, consider installing a water purification system or getting a professional to check your water supply.
  2. Clean the ice bin: Regularly clean and sanitize the ice bin to ensure your ice doesn’t pick up foreign tastes. A mixture of vinegar and warm water can be an effective cleaning solution.
  3. Replace the water filter: Regularly replacing your water filter ensures that it can effectively filter out impurities, resulting in better-tasting ice.

While it’s empowering to fix minor problems yourself, some Sub-Zero ice maker issues may require professional assistance. If you find your Sub-Zero ice maker not working and you’re unable to fix it yourself, don’t worry. Just contact Appliance Service Station for professional Sub-Zero refrigerator and ice maker repair. Our seasoned professionals are capable of handling any issue with your appliance efficiently and effectively.

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