Fast, Same Day Service | Monday - Friday: 8 am - 5 pm

Same Day Appliance Repair®️

the home of fast, friendly & dependable service

  • Refrigerators
  • 7 Reasons Why Your Sub-Zero Refrigerator Isn’t Freezing

Table of Contents

7 Reasons Why Your Sub-Zero Refrigerator Isn’t Freezing

Sub-Zero Refrigerator Isn't Freezing

Let’s say you’ve just returned from a long day and all you want is a scoop of your favorite ice cream, only to find that your Sub-Zero refrigerator isn’t freezing. A refrigerator running but not freezing can turn your night into a nightmare, and that’s why we’re here to help! Keep reading to dive into a detailed guide on what could be going wrong and how to set it right.

Understanding Why Your Sub-Zero Refrigerator Isn’t Freezing

When you’re dealing with a Sub-Zero freezer that won’t freeze, it’s crucial to understand the myriad of factors that could be at play. Let’s take a detailed look at each potential culprit and explore troubleshooting steps, solutions, and preventative measures.

Freezer Temperature Not Set Correctly

If your freezer seems warm, the first thing you should do is confirm if the temperature setting is correct. Sometimes the issue is as simple as someone accidentally bumping into the control panel. If the freezer temperature isn’t cold enough, your refrigerator won’t make ice cubes either.

How to troubleshoot:

  1. Locate your temperature control panel, often situated inside or at the front of the freezer.
  2. Check if the temperature matches the correct freezer settings for a Sub-Zero refrigerator, usually around 0°F (-18°C).
  3. Adjust the temperature if necessary and wait a few hours to see if there’s an improvement.

Tips for preventing accidental adjustments:

  • Keep the control panel locked, if your model has that feature.
  • Regularly check the temperature, especially after cleaning or restocking your freezer.
why won't my Sub-Zero freezer freeze
Image from Sub-Zero

Freezer Door Not Sealing Shut

Sub-Zero freezer temperature problems often arise from a door that won’t seal properly. A poorly sealed door allows warm air to enter, making it difficult for the appliance to maintain the ideal freezing temperature.

Common Causes:

  1. Door Left Ajar: Perhaps someone didn’t close the door completely.
  2. Items Blocking Closure: Overstuffed freezer compartments can prevent the door from closing.
  3. Warped or Damaged Door Gasket: The rubber seal around the door can deteriorate over time.

How to Tackle Each Issue:

  • For doors left ajar, simply ensure the door is securely closed.
  • If items are blocking the door, reorganize the freezer and remove any obstructions.
  • A damaged gasket should be replaced. You can purchase a new one from Sub-Zero or a reliable third-party retailer.

Preventative Steps:

  • Install door alarms that alert you when the door has been left open.
  • Periodically check the door gasket for wear and tear.

Storing Too Many Items

Believe it or not, an overstuffed freezer can actually prevent effective freezing. When you load up your freezer to the brim, you impede air circulation, making it hard for the appliance to distribute cold air evenly.


If your freezer is fully packed, try removing some items. Rearrange the remaining items to allow for better airflow, making sure vents aren’t blocked.

How to Maintain an Efficiently Packed Freezer:

  • Don’t stack items tightly together.
  • Leave some room between items to allow for air circulation.
refrigerator running but not freezing
Image from Mashed

Condenser Coils are Dirty

Dirty condenser coils can decrease the efficiency of your Sub-Zero refrigerator, making it run harder than necessary. Over time, this affects the appliance’s ability to keep things frozen.

Step-by-Step Cleaning Guide:

  1. Unplug your refrigerator.
  2. Locate the coils, often found at the back or underneath the appliance. For Some Sub-Zero models, the condenser coils are found at the top behind a panel.
  3. Use a coil brush or vacuum to clean off the dirt and dust.

Maintenance Tips:

  • Set a reminder to clean the coils every three to six months.
  • Ensure the area around the refrigerator is clean to minimize dust buildup.

Evaporator Fan Not Working

The evaporator fan circulates cold air throughout the freezer. If it stops working, you’ll notice a rise in temperature. Issues could range from a blade obstruction to a completely defective fan.

How to Identify the Problem:

  1. Listen for a humming noise—no sound usually indicates a problem.
  2. Remove the back panel and visually inspect the fan for obstructions or visible damage.

Note: This issue often requires professional repair, especially if it involves electrical or motor issues.

Faulty Thermostat or Temperature Sensor

Sometimes, the device responsible for gauging and maintaining the freezer’s temperature might malfunction. This is particularly tough for the average homeowner to diagnose.

What to Do:

  1. If you’ve ruled out all other issues and your refrigerator is still running but not freezing, consult with a technician to test the thermostat.

Future Prevention:

Regular maintenance and inspection can catch a faulty thermostat before it completely ruins your day.

Sealed System Defect

Issues like refrigerant leaks or a faulty compressor fall under this category. These problems are serious and often warrant professional service.


If you suspect a sealed system defect, it’s best to consult your local Sub-Zero repair professionals. This is not a DIY fix!

For those who find that their Sub-Zero refrigerator isn’t freezing despite trying all the troubleshooting steps, contact the refrigerator and freezer repair experts at Same Day Service Company for reliable and efficient repairs.

Table of Contents


browse repair tips & maintenance advice...

browse home & family content...

become a member & save

$10 off appliance repair

Members receive exclusive tips, tricks, discounts, recall alerts, and more.

leave it to the pros...

Same Day Appliance