August 12, 2026

Sub-Zero 7042803 Ice Maker Filter: Replacement Guide for UC-15I and UC-24 Series

Quick answer: The Sub-Zero 7042803 is the water filter for Sub-Zero built-in ice machines (UC-15I, UC-15IP, UC-24CI, UC-25IS) and supersedes the older 7012333: order 7042803 for either code. It reduces scale, chlorine and particulates before the water reaches the ice mold, which is what keeps a $4,000 ice machine producing clear, clean-tasting ice. Replace every 6 months: an exhausted cartridge shows up as slower production, cloudier cubes and scale inside the machine.

Fit and cross-reference

Your machine	Filter code on the old cartridge	What to order
Sub-Zero UC-15I, UC-15IP	7042803 or 7012333	Sub-Zero 7042803 replacement
Sub-Zero UC-24CI, UC-25IS	7042803 or 7012333	Sub-Zero 7042803 replacement

7012333 is the discontinued predecessor; 7042803 is the current form for the same housing. 6-month replacement cycle.

Why ice machines punish an old filter faster than fridges do

A clear-ice machine freezes water in thin layers and rinses impurities away as it builds each cube, so everything the filter misses either clouds the ice or deposits as scale on the evaporator plate. Scale is the expensive part: it insulates the plate, stretches cycle times and eventually calls for a service visit that costs more than a decade of cartridges. In hard-water cities (check yours in the free water report), the 6-month cycle is a maximum, not a suggestion.

Replacement in four steps

(1) Locate the cartridge behind the kick plate or in the machine compartment, per your model’s manual. (2) Twist the old cartridge a quarter-turn and pull; a cup catches the residual ounce of water. (3) Seat the new 7042803 and quarter-turn until snug. (4) Run and discard the first two ice batches, the machine’s equivalent of the flush. No tools, ten minutes including the cleanup you’ll be inspired to do behind the kick plate.

Frequently asked questions

My cartridge says 7012333. Is 7042803 really the same fit?

Yes: 7042803 is Sub-Zero’s successor part for the same housing, and the correct order for any machine that used 7012333. Wrong-fit worry is covered anyway: $1,000 guarantee, 365-day returns.

Can I run the ice machine without the filter?

Mechanically yes with the bypass, but on a clear-ice machine the filter is doing visible work: expect cloudier ice and faster scaling. The general bypass trade-offs are covered in running without a filter.

Does this cartridge fit Sub-Zero refrigerators too?

No: this is the built-in ice machine format. Sub-Zero refrigerators use different cartridges by series; email us your model number and we will confirm the right part the same day.