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Why Your Sub-Zero Refrigerator Freezer Makes Noise When Door is Closed

One of the hallmarks of a superior appliance is how quietly it operates and your Sub-Zero refrigerator is no exception. When your Sub-Zero refrigerator freezer makes noise it can be seriously annoying. Common causes include a faulty evaporator fan motor, ice build-up, and fan obstruction.

Pinpointing the Problem When your Sub-Zero Refrigerator Freezer Makes Noise

Trying to figure out why your Sub-Zero refrigerator freezer makes noise when door is closed can feel like finding a needle in a haystack. But there are usually just a few common causes for a Sub-Zero humming noise.

Oftentimes this constant humming is due to a malfunctioning evaporator fan motor. Follow these simple steps will help determine if this part is the culprit when your Sub-Zero refrigerator freezer makes noise.

Step 1: Open all the doors
If your model refrigerator has more than one door, open both as well as the freezer door. A refrigerator or freezer evaporator fan stops running when the doors are open. Listen to determine if the sound stops when you open the doors.

Step 2: Close just the refrigerator door
If the noise returns when you close the refrigerator doors it’s likely caused by a faulty refrigerator evaporator fan motor.

Step 3: Re-open refrigerator doors

Step 4: Close only the freezer door
If your Sub-Zero freezer noisy when door is closed it’s likely that a faulty freezer evaporator fan motor is the cause.

Step 5: Close all doors to your refrigerator and freezer
If the refrigerator noise stops when freezer door is closed as well as the refrigerator doors, the evaporator fan motor is typically not the cause.

This video shows a good example of the loud humming coming from the unit when the freezer drawer is closed:

Photo Credit: nitramsg

Common Causes for a Noisy Sub-Zero Refrigerator Freezer

Now that you can narrow down your Sub-Zero freezer noise here’s what you might need for this particular Sub-Zero refrigerator repair:

Evaporator fan motor

The evaporator fan motor is located in the freezer and works to circulate the cold air created by the refrigerator’s evaporator coils. If the fan is malfunctioning you’ll notice your Sub-Zero refrigerator freezer makes noise that sounds like a loud humming. You may also notice that your freezer is warmer than it should be since the fan isn’t circulating any cold air. An evaporator fan motor cannot be repaired and will need to be replaced.

Ice Build Up

Another cause when your Sub-Zero refrigerator makes noise can be from ice build up in the freezer. Locate any build up in a specific area, removing freezer drawers if necessary. Consult your Sub-Zero manual to determine if the freezer section can be disabled to allow for the ice to melt or be removed.

Fan obstruction

Another possible cause for a loud Sub-Zero refrigerator freezer can result when an object blocks the evaporator fan. Check to make sure that food packages or other loose freezer items are not obstructing the fan.

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