Sub-Zero refrigerators are some of the best appliances available today. However, there are a few Sub-Zero built-in refrigerator maintenance tasks you should stay on top of. Learn how to clean the coils, replace the air filter, and change the water filter in your Sub-Zero built-in refrigerator.

*Built-in models are now referred to as Classic models by the manufacturer.

Top 3 Sub-Zero Built-In Refrigerator Maintenance Tasks

Clean Sub-Zero Refrigerator Coils

Over time, dust, hair, and pet dander collect on your refrigerator condenser coils. This essentially suffocates your refrigerator and can, in turn, lead to refrigerator repair problems, including:

  • refrigerator not cool
  • refrigerator makes loud noise
  • refrigerator runs constantly

We recommend that you clean Sub-Zero built-in refrigerator coils every three to six months, more often if you have pets. If you’re not familiar with how to clean Sub-Zero refrigerator coils, follow these steps:

  1. Turn the electricity off at the control panel.
  2. Pull the bottom edge of the grille up and out to access the condenser coils.
  3. Use a soft brush vacuum hose attachment to remove debris from the coils.
  4. Vacuum in the direction of the coils (up and down) only so as not to damage them.
  5. Close the condenser grille cover.

Pro Tip: Wear gloves and a dust mask during this Sub-Zero built-in refrigerator maintenance task to protect yourself from sharp edges and allergens.

how to clean sub-zero condenser coils

Photo Credit: Sub-Zero

Replace Sub-Zero Air Filter

The air filter in a Sub-Zero built-in refrigerator purifies the air inside the unit. It removes bacteria, mold, and viruses, keeping your food fresher and healthier.

Air filters last for approximately one year. When it’s time to change the filter, an indicator will flash on the control panel. (A small square with arrows flowing through it, just to the left of the refrigerator temperature reading.) To change the air filter in your Sub-Zero refrigerator, follow these instructions:

  1. Locate the air filter housing on the back wall of your refrigerator.
  2. Pull the cover out and up from the bottom.
  3. Pull the next flap out and down from the top, exposing the cartridge.
  4. Remove the cartridge by gently pulling it up and out.
  5. Snap the new cartridge into place, with the connector pointing down.
  6. Close the inner flap and listen for a click.
  7. Close the outer cover.
  8. Press the Pure Air keypad for five seconds to reset the indicator.

Pro Tip: Only purchase air filters from authorized dealers, or from the Sub-Zero Accessory Store. It’s helpful to have your filter number handy when purchasing online.

sub-zero built in refrigerator maintenance

Photo Credit: Sub-Zero

Change Sub-Zero Water Filter

Your routine Sub-Zero built-in refrigerator maintenance wouldn’t be complete without changing the water filter. If you don’t replace a dirty water filter, you may start to notice some of these not-so-pleasant symptoms:

  • refrigerator water tastes bad
  • ice from refrigerator smells bad

You should replace the filter when the indicator light directs you to, which is typically once per year, depending on use. To replace a Sub-Zero water filter:

  1. Pull the bottom edge of the grille out and up to expose the water filter.
  2. Remove the filter – your unit either has a push-in or twist-in filter:
    › push it in and pull out or…
    › rotate the cartridge counterclockwise 1/4 turn and pull out
  3. Remove the plastic caps from the new filter.
  4. Place the new filter in the filter manifold, lining up the locking tabs.
  5. Push in or twist clockwise until you hear a click.
  6. Gently pull on the filter to verify that it is secure.
  7. Press and hold the reset filter button for five seconds.

Pro Tip: Discard the first two full containers of ice and several glasses of water to clear the water filtration system after changing your Sub-Zero built-in water filter.

change sub-zero water filter

Photo Credit: Sub-Zero Youtube