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It seems like you're unsure about the model or serial number. To ensure you receive the correct part, we strongly recommend verifying this information before placing your order. You can find the serial number on your appliance using our guide jump to the manual. If you need further assistance, please contact us, and our team will help you find the correct part for your Sub-Zero appliance.

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How to Locate and Replace Your Sub-Zero Water Filter

Replacing the water filter in your Sub-Zero appliance is an essential part of maintaining optimal performance and ensuring clean, fresh-tasting water. This guide will help you locate the water filter on various Sub-Zero models, understand when it needs replacement, and walk you through the steps to change it safely and efficiently.

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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, it is recommended to discard the first several glasses of water and the first two full containers of ice to ensure optimal water quality. Water filter replacement procedures vary depending on the filter type and model. Please refer to the instructions below for detailed, product-specific replacement steps.

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

Dispense water for two minutes or discard the first two containers of ice to remove air or impurities.

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

Dispense and discard several glasses of water to flush any air and carbon particles.

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.
The filter life will reset for approximately one year.

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

Discard the first batch of ice produced after replacing the water filter to ensure impurities are cleared from the system.

Explore our extensive collection of expert Sub-Zero repair guides and service manuals.

Comprehensive Guide to Replacing Sub-Zero Refrigerator Door Gaskets

Learn how to replace the door gasket on your Sub-Zero refrigerator with our step-by-step guide. Maximize your refrigerator’s efficiency and ensure a tight seal for optimal cooling.

Sub-Zero Repair & Maintenance Guides

Complete guides to replacing and installing replacement parts for Sub-Zero refrigerators and appliances. Learn how to properly replace gaskets, filters and other parts with our step-by-step instructions.

Sub-Zero Ice Maker Troubleshooting Guide – Comprehensive Solutions for Common Ice Maker Issues

Complete guide to troubleshooting Sub-Zero ice makers. Includes solutions, steps, and a link to our catalog for easy ice maker replacement if needed.

Step-by-Step Guide to Testing the Water Inlet Solenoid Valve for Sub-Zero Ice Makers

Learn how to test the water inlet solenoid valve in your Sub-Zero ice maker to ensure optimal functionality. Follow our diagnostic guide and find genuine Sub-Zero replacement valves.

How to Diagnose Cooling Issues in Sub-Zero Refrigerators: Troubleshooting the Condenser Fan Motor (Part #4200740)

Learn how to diagnose cooling issues in your Sub-Zero refrigerator. A non-functioning condenser fan motor (Part #4200740) is a common cause of poor cooling. Follow our guide to diagnose the issue and find replacement parts.

How to Check Sub-Zero Switches: A Comprehensive Guide

Learn how to inspect and troubleshoot switches in your Sub-Zero appliances. This step-by-step guide ensures your refrigerator or freezer operates at peak performance.

How to Locate Your Sub-Zero Appliance Serial Number | SubZeroParts.com

Find out how to easily locate the serial number on your Sub-Zero appliance with our comprehensive guide. Identifying your model is crucial for finding the right parts.