Sub-Zero 4204490 Refrigerator Water Filter

Product Description

The Sub-Zero 4204490 is the genuine OEM water filter for Sub-Zero Classic Series, PRO Series, Designer Series, and Integrated refrigerators. Manufactured at Sub-Zero's factory in Madison, Wisconsin, this filter is engineered to the same standards as your Sub-Zero appliance — delivering consistently clean, fresh water and ice while protecting the internal components of your refrigerator from sediment and scale buildup.

The 4204490 uses an activated carbon block design with a twist-lock installation mechanism located behind the front grille of your refrigerator. Sub-Zero recommends replacing this filter every 12 months, or when the refrigerator's filter replacement indicator activates — whichever comes first. Your refrigerator will alert you automatically when it is time for a new filter.

Key Features

• NSF Certified: Meets or exceeds NSF/ANSI Standards 42 and 53 for chlorine taste, odor, and contaminant reduction
• Chlorine Reduction: Reduces chlorine taste and odor for fresh, great-tasting water and ice
• Scale Inhibition: Inhibits hard scale formation that can damage internal water lines and components over time
• Sediment Filtration: Removes rust, sediment, and particulates for clearer water and ice
• 12-Month Lifespan: Sub-Zero recommends replacement every 12 months — longer than most refrigerator filters
• Twist-Lock Design: Tool-free installation — no water shutoff required
• Made in the U.S.A.: Genuine OEM part manufactured at Sub-Zero's Madison, Wisconsin factory
• Grille-Access Installation: Filter is located behind the front kick grille at the base of the refrigerator
• Automatic Replacement Alert: Your Sub-Zero refrigerator will display a reminder when the filter is due for replacement
• Broad Compatibility: Fits Sub-Zero Classic Series, PRO 48 Series, Designer Series, and Integrated refrigerators

Compatible Refrigerator Models

This filter is compatible with Sub-Zero Classic Series (BI prefix), PRO Series, Designer Series (IT, ID, IC prefix), and Integrated refrigerators. The filter is accessed by lifting or pulling the front kick grille at the base of the unit.

Sub-Zero PRO Series

Sub-Zero Classic Series — Over-and-Under (BI-30U, BI-36U)

Sub-Zero Classic Series — Side-by-Side (BI-36S, BI-42S, BI-48S)

Sub-Zero Classic Series — All Freezer (BI-36F) & Other

Sub-Zero Designer Series (ID, IT prefix)

Sub-Zero Integrated Series (IC prefix)

Compatibility Tip: To confirm this is the correct filter for your Sub-Zero, check the filter label currently installed in your refrigerator. If it reads 4204490, 4290510, or 9030868, this is your correct replacement. Sub-Zero refrigerators with serial numbers between 4116297 and 4134313 should contact Sub-Zero directly to confirm the correct part number.

Alternate Compatible Part Numbers

4204490, 4290510, 9030868, 7012975, 4204496, EWF-8003A, SGF-ZS48, AQF-4204490, WF490

Installation Instructions

1. Locate the Filter: The filter is located behind the front kick grille at the base of the refrigerator. Lift the grille assembly by pulling out on the bottom edge and tilting it forward to expose the filter housing
2. Remove Old Filter: Twist the old filter counterclockwise (left) approximately a quarter turn to unlock, then pull it straight out. No water shutoff is required — the internal valve closes automatically
3. Install New Filter: Insert the new filter into the housing and push firmly, then twist clockwise (right) until it locks into place. Do not use tools
4. Replace the Grille: Tilt the grille back into its original position and snap it closed
5. Flush the System: Run water through the dispenser for 3-5 gallons to flush air and activate the carbon block. Water may appear slightly cloudy initially — this is normal and will clear
6. Reset Filter Indicator: Reset the filter replacement indicator on your Sub-Zero control panel per your owner's manual. The method varies by model — refer to your manual for the specific reset procedure

Replacement Schedule

Frequently Asked Questions

Will this filter work in my Sub-Zero UC-15 ice maker?

No. The 4204490 is designed for Sub-Zero built-in and integrated refrigerators only. The UC-15 undercounter ice maker uses a completely different filter — the 7012333 (also sold as 7042803) — which has a different physical shape and housing. The two filters are not interchangeable.

What is the difference between 4204490, 4290510, and 9030868?

All three are the same filter. Sub-Zero uses different part numbers for inventory and packaging purposes, but the filter inside is identical across all three. If your refrigerator currently has any of these three part numbers installed, this filter is the correct replacement.

My Sub-Zero has a serial number between 4116297 and 4134313 — which filter do I need?

Sub-Zero recommends that owners of refrigerators with serial numbers between 4116297 and 4134313 contact Sub-Zero directly to confirm the correct filter part number. This specific serial number range may require a different filter variation. You can reach Sub-Zero customer service at 1-800-222-7820.

Where is the filter located in my Sub-Zero refrigerator?

The 4204490 filter is located behind the front kick grille at the base of the refrigerator — not inside the refrigerator compartment. To access it, pull out on the bottom edge of the grille and tilt it forward. The filter housing is located directly behind the grille.

How often should I replace the 4204490 filter?

Sub-Zero recommends replacing this filter every 12 months, which is longer than most refrigerator water filters. Always replace it when your Sub-Zero's filter indicator activates, even if 12 months have not yet passed. Also replace after any extended shutdown period or if you notice reduced water flow or any change in water taste.