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How to Locate and Replace Your Sub-Zero Water Filter

Replacing the water filter in a Sub-Zero appliance may help maintain water flow and filtration. This guide explains where filters are located on several model families and provides general replacement steps. Confirm the appliance model and serial number and follow the applicable manufacturer documentation before beginning.
Independent guide: This article provides general information from SubZeroParts.com. It is not a factory service manual or manufacturer-issued instruction and is not endorsed by Sub-Zero Group, Inc. Verify the appliance model and serial number, follow official manufacturer documentation, and use a qualified service professional where appropriate.
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Locating and Replacing the Water Filter on Different Models

Not all Sub-Zero products are equipped with a water filtration system.

Models from the 200/300, 500, 600, and 700 Series, as well as Undercounter units, Designer Drawers, and certain ice makers, do not include a water filter. After replacing the water filter, follow the appliance documentation for flushing the system or discarding initial water or ice. Replacement procedures vary by filter type and model, so use the applicable model-specific instructions below.

Replace Water Filter

Sub-Zero built-in refrigerator serial number location inside compartment
Classic Series (BI, CL)
Includes models: BI-30U, BI-36U, BI-36F, BI-36R, BI-36S, BI-42S, BI-48S, BI-48SD, CL-3650, CL-4250, CL-4850, and others.
Twist-In Style Water Filter Replacement
(For models with twist-in filters, such as earlier BI models.)

Finding the Water Filter
  • The water filter is located behind the top grille inside the refrigerator compartment.
Replacing the Water Filter
  • Open the refrigerator door and look at the top section or tilt down the grille to access the filter.
  • Rotate the filter one-quarter turn counterclockwise to release it.
  • Pull the filter straight out from the housing.
Installing the New Filter
  • Remove any protective caps from the new filter.
  • Insert the new filter into the housing.
  • Turn the filter one-quarter turn clockwise until it locks into place.
Resetting the Water Filter Indicator
  • Press and hold the white filter reset button for 5 seconds to reset the indicator.
Flushing the System
  • Follow the appliance documentation for flushing the system and discarding initial water or ice.


Push-In Style Water Filter Replacement
(For models with push-in cartridge filters, such as newer CL models.)

Finding the Water Filter
  • The water filter is located inside the refrigerator compartment, at the top behind a small access panel.
Replacing the Water Filter
  • Open the refrigerator door and locate the access panel.
  • Pull open the panel to reveal the water filter.
  • Firmly push the old filter inward until it clicks and ejects.
  • Pull the filter straight out.
Installing the New Filter
  • Remove any protective caps from the new filter.
  • Align and insert the new filter straight into the housing.
  • Push it firmly until it clicks into place.
Resetting the Water Filter Indicator
  • On the control panel, navigate to: Settings → Water Filter → Life Remaining → Hold Refresh to reset.
Flushing the System
  • Follow the appliance documentation for flushing the system after installing the filter.
Sub-Zero Designer Series Refrigerator serial number location inside compartment
Designer Series (IT, IC, DET, DEC)
Includes models: IT-30CI, IT-36CI, IT-30CIID, IT-36CIID, IC-30RID, IC-36RID, IC-30FI, IC-36FI, DET3050CI, DEC3050CI, and others.
Integrated Water Filter Replacement

Open the Refrigerator Door
  • Open the refrigerator door to access the interior.
Access the Water Filter
  • At the top of the interior, above the control panel, pull out on the bottom edge of the water filter access door panel with "Sub-Zero" printed on it.
  • Rotate the panel upward to reveal the water filter.
  • Note: It may be necessary to remove the right or left side trim panel to fully rotate the water filter panel.
Remove the Old Filter
  • Rotate the old filter counterclockwise one-quarter turn.
  • Pull the filter straight out.
  • It is normal for a small amount of water to drip when the filter is removed. Wipe up any water with a paper towel or cloth.
Prepare the New Filter
  • Remove the new filter from its packaging.
  • Take off the plastic cap.
Install the New Filter
  • Insert the new filter into the manifold.
  • Turn it clockwise until it locks securely into place.
Reset the Water Filter Indicator
  • Follow the instructions on the control panel to reset the filter life cycle.
  • Confirm that the filter-life indicator has reset according to the appliance documentation.
Flush the System
  • For dispenser models, although the water line is typically purged before connecting to the unit, discard the first several glasses of water after replacing the filter.
PRO Series (PRO 36, PRO 48)
Includes models: PRO-36, PRO-48, PRO-36G, PRO-48G, and others.
Twist-In Style Water Filter Replacement

Open the Grille
  • Locate the grille at the top of the appliance.
  • Pull out on the bottom edge of the grille to release it.
  • Rotate the grille upward to access the water filter compartment.
Remove the Old Filter
  • Rotate the old filter counterclockwise one-quarter turn.
  • Pull the filter straight out from the housing.
  • Note: A small amount of water may drip during removal. Wipe up any water with a paper towel or cloth.
Prepare the New Filter
  • Remove the new filter from its packaging.
  • Take off the plastic protective cap.
Install the New Filter
  • Insert the new filter into the manifold opening.
  • Turn the filter clockwise one-quarter turn until it locks into place.
Reset the Water Filter Indicator
  • Press and hold the filter reset button for five seconds.
  • This will reset the filter life monitoring system.
Flush the System
  • Dispense and discard several glasses of water to clear any trapped air or carbon fines from the new filter.
Sub-Zero PRO Series Refrigerator serial number location inside appliance
648PRO Series
Includes models: 648PRO, 648PROG.
Twist-In Style Water Filter Replacement

Open the Grille
  • Locate the grille at the top of the appliance.
  • Pull out on the bottom edge of the grille to release it.
  • Rotate the grille upward to access the water filter compartment.
Remove the Old Filter
  • Rotate the old filter counterclockwise one-quarter turn.
  • Pull the filter straight out from the housing.
  • Note: A small amount of water may drip when removing the filter. Wipe up any water with a paper towel or cloth.
Prepare the New Filter
  • Remove the new filter from its packaging.
  • Remove the plastic protective cap from the filter.
Install the New Filter
  • Insert the new filter into the manifold opening.
  • Turn the filter clockwise one-quarter turn until it locks securely into place.
Reset the Water Filter Indicator
  • Press and hold the filter reset button for five seconds to reset the filter life cycle.
Flush the System
  • Dispense and discard several glasses of water to remove any air and carbon particles from the new filter.
Sub-Zero Wine Storage serial number location inside unit
UC-151 Undercounter Ice Maker
Includes models: UC-151.
Twist-In Style Water Filter Replacement

Turn Off the Ice Maker
  • Before replacing the filter, turn off the ice maker using the control panel.
Access the Water Filter
  • Open the door of the unit to locate the water filter compartment inside.
Remove the Old Filter
  • Rotate the old filter counterclockwise one-quarter turn.
  • Pull the filter straight out from the housing.
  • Note: A small amount of water may drip when removing the filter. Wipe up any water with a paper towel or cloth.
Prepare the New Filter
  • Remove the new filter from its packaging.
  • Remove the plastic protective cap.
Install the New Filter
  • Insert the new filter into the manifold opening.
  • Turn the filter clockwise one-quarter turn until it locks securely into place.
Reset the Water Filter Indicator
  • Press and hold the CLEAN button on the control panel for six seconds to reset the water filter indicator.
Flush the System
  • Follow the appliance documentation for discarding initial ice after replacing the filter.
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