--- title: "Sub-Zero UC-15I REPLACE FILTER lit red" description: "What REPLACE FILTER means on Sub-Zero UC-15I REPLACE FILTER lit reds, what to check before booking, and when it is not a failure at all." url: "https://icemakerrepair.center/error-codes/sub-zero-replace-filter/" --- # Sub-Zero UC-15I REPLACE FILTER lit red On the UC-15I, REPLACE FILTER lights red after 8,000 ice making cycles. ## What REPLACE FILTER actually means. On the UC-15I, REPLACE FILTER lights red after 8,000 ice making cycles. The guide also recommends a new filter every six months or after a long shutdown, whichever comes first. Sub-Zero ice maker display What to do when REPLACE FILTER shows on the ice maker ### Kind of code Mode, not a failure Something the ice maker was switched into, often without anyone noticing, rather than something that broke: ice turned off from the panel or by the wire arm lifted while reaching into the bin, a control lock, a Sabbath setting, a cleaning cycle still running, a reminder that the water filter is due. No part has worn out, and the ice maker's own buttons or arm put it right. ### Usually leads to No repair Turn the unit off with POWER and scoop the ice out of the bin. ### Shows up as Ice Tastes or Smells Bad The ice tastes bad or smells stale, musty, of plastic or of whatever else is in the freezer, even though a glass of tap water tastes fine. ### Make Sub-Zero Sub-Zero ice maker service, for ice makers in built-in units and those under the counter. ### Source Sub-Zero UC-15I undercounter ice maker Use & Care Guide (subzero-wolf.com PDF) Sub-Zero UC-15I undercounter ice makers with the built-in filter. ## Before you book, in this order. Each step comes from Sub-Zero's own guidance for REPLACE FILTER on its ice makers. Follow it to the end: the last card says whether this is a visit. 01 Turn the unit off with POWER and scoop the ice out of the bin. 02 Turn the old filter a quarter turn counterclockwise, fit the new one a quarter turn clockwise, then run the unit for three minutes, switch it off and on. 03 Touch and hold CLEAN for 6 seconds to reset the reminder; book a visit if ice making stays poor with a fresh filter. ### Cleared? The ice maker is filling and dropping cubes again and no part was needed. If the same code returns during the next harvest, or water shows up on the floor again, book it as a new problem. ### What not to do REPLACE FILTER is a maintenance reminder, not a sign that anything has failed. The unit keeps making ice while it is lit. ## What you may notice with it. The ice maker problems REPLACE FILTER tends to arrive with. Answer these at the ice maker before anyone is booked. [All problems](https://icemakerrepair.center/problems/) Before you call ### [Ice Tastes or Smells Bad](https://icemakerrepair.center/problems/ice-tastes-or-smells-bad/) [All 5 causes, cheapest first](https://icemakerrepair.center/problems/ice-tastes-or-smells-bad/) It also comes with - [**Ice Maker Making Small or Hollow Cubes**](https://icemakerrepair.center/problems/ice-maker-making-small-or-hollow-cubes/) - [**Ice Maker Error Code**](https://icemakerrepair.center/problems/ice-maker-error-code/) Problem ### Ice Tastes or Smells Bad 5 causes, cheapest first No repair indicated ## Nothing to repair. Something the ice maker was switched into, often without anyone noticing, rather than something that broke: ice turned off from the panel or by the wire arm lifted while reaching into the bin, a control lock, a Sabbath setting, a cleaning cycle still running, a reminder that the water filter is due. No part has worn out, and the ice maker's own buttons or arm put it right. [How to read what your ice maker is telling you](https://icemakerrepair.center/problems/ice-maker-error-code/) ## Sub-Zero ice makers. Sub-Zero ice maker service, for ice makers in built-in units and those under the counter. [Sub-Zero ice maker repair](https://icemakerrepair.center/brands/sub-zero/) More Sub-Zero codes [EC30](https://icemakerrepair.center/error-codes/sub-zero-ec30/) [30 8 05](https://icemakerrepair.center/error-codes/sub-zero-30-8-05/) [30 8 10](https://icemakerrepair.center/error-codes/sub-zero-30-8-10/) [30 8 30](https://icemakerrepair.center/error-codes/sub-zero-30-8-30/) [30 9 01](https://icemakerrepair.center/error-codes/sub-zero-30-9-01/) [30 9 10](https://icemakerrepair.center/error-codes/sub-zero-30-9-10/) [30 9 86](https://icemakerrepair.center/error-codes/sub-zero-30-9-86/) [40 8 40](https://icemakerrepair.center/error-codes/sub-zero-40-8-40/) [40 8 01](https://icemakerrepair.center/error-codes/sub-zero-40-8-01/) [40 9 40](https://icemakerrepair.center/error-codes/sub-zero-40-9-40/) [50 U 86](https://icemakerrepair.center/error-codes/sub-zero-50-u-86/) [50 U 87](https://icemakerrepair.center/error-codes/sub-zero-50-u-87/) [All 15 Sub-Zero codes](https://icemakerrepair.center/error-codes/#codes-sub-zero) Mode, not a failure on other makes [Bertazzoni Water filter symbol](https://icemakerrepair.center/error-codes/bertazzoni-water-filter-symbol/) [Café Time to Clean flashing](https://icemakerrepair.center/error-codes/cafe-time-to-clean-flashing/) [Dacor Filter indicator blinking red](https://icemakerrepair.center/error-codes/dacor-filter-indicator-blinking/) [Electrolux Replace Water Filter](https://icemakerrepair.center/error-codes/electrolux-replace-water-filter/) [Frigidaire Water Filter Status](https://icemakerrepair.center/error-codes/frigidaire-water-filter-status/) [Fulgor Milano Replace filter](https://icemakerrepair.center/error-codes/fulgor-milano-replace-filter/) [GE Profile Yellow front button](https://icemakerrepair.center/error-codes/ge-profile-yellow-front-button/) [GE Time to Clean light](https://icemakerrepair.center/error-codes/ge-time-to-clean-light/) [All 38 codes of this kind](https://icemakerrepair.center/error-codes/#family-mode) Sub-Zero builds this ### Door ice maker The ice maker that feeds the dispenser on the outside of a door: tucked into an insulated box in the left door of a French door model, or at the top of the freezer side of a side-by-side, with a chute and an auger carrying cubes to your glass. Sub-Zero builds this ### Freezer ice maker The ice maker that sits inside the freezer compartment itself, a tray that twists or a mold with a heater and an ejector, dropping cubes into a bin or drawer you open by hand, with no dispenser on the door. Sub-Zero builds this ### Undercounter ice maker A built-in residential ice maker that lives under a kitchen, bar or basement counter, making clear cubes or chewable nugget ice on its own cooling system, with a water line in and a gravity drain or a small drain pump out. ## In Sub-Zero's own words > When the unit completes 8000 ice making cycles, “REPLACE FILTER” will illuminate red [Sub-Zero UC-15I undercounter ice maker Use & Care Guide (subzero-wolf.com PDF)](https://www.subzero-wolf.com/-/media/files/united-states/product-downloads/sub-zero-wolf/use-and-care/sub-zero/uc-15i-ucg.ashx) [Sub-Zero UC-15I undercounter ice maker Use & Care Guide (subzero-wolf.com PDF)](https://www.subzero-wolf.com/-/media/files/united-states/product-downloads/sub-zero-wolf/use-and-care/sub-zero/uc-15i-ucg.ashx) [Sub-Zero UC-15I undercounter ice maker Use & Care Guide (subzero-wolf.com PDF)](https://www.subzero-wolf.com/-/media/files/united-states/product-downloads/sub-zero-wolf/use-and-care/sub-zero/uc-15i-ucg.ashx) Every code on this site is taken from the manufacturer's documentation, never from a forum or a parts listing. Sub-Zero UC-15I undercounter ice makers with the built-in filter. ## Sub-Zero REPLACE FILTER ice maker repair, where we come out. The same visit in every metro below: the code, the model number, and a diagnosis before any part is ordered. 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Turn the unit off with POWER and scoop the ice out of the bin. ### Do I have to shut off the water to change the Sub-Zero UC-15I filter? No. The ice maker bypasses the filter while it is removed, so the supply can stay on during the swap. ### I fitted a new filter in my Sub-Zero UC-15I, so why is REPLACE FILTER still red? The reminder does not reset on its own. Hold CLEAN for 6 seconds after fitting the new filter to clear it. ### Can an overdue filter make a Sub-Zero undercounter ice maker slow? Yes. Sub-Zero lists a clogged filter among the causes of low ice production and poor cubes, so a due filter is worth changing before other checks. --- **[Read on the site: Sub-Zero UC-15I REPLACE FILTER lit red](https://icemakerrepair.center/error-codes/sub-zero-replace-filter/)** **[Book a visit with IceMakerRepair.center](https://icemakerrepair.center/schedule/)**