--- title: "Sub-Zero 50 U 86: the flow meter measured low water flow" description: "What 50 U 86 means on Sub-Zero 50 U 86: the flow meter measured low water flows, what to check before booking, and when it is not a failure at all." url: "https://icemakerrepair.center/error-codes/sub-zero-50-u-86/" --- # Sub-Zero 50 U 86: the flow meter measured low water flow On Classic (BI) built-in models, 50 U 86 means the water flow meter measured low flow. ## What 50 U 86 actually means. On Classic (BI) built-in models, 50 U 86 means the water flow meter measured low flow. Slow flow can shortchange the ice maker and the dispenser, giving small cubes and weak water streams. Sub-Zero ice maker display · also shown as 50-U-86, 50U86 What to do when 50 U 86 shows on the ice maker ### Kind of code Water supply and fill The ice maker asked for water and got too little, too slowly or none at all, or water kept arriving after the fill should have ended. A closed shutoff, a kinked line, a clogged filter and low house pressure are ruled out before the water inlet valve is replaced or the fill tube is thawed. If water is on the floor, close the supply valve before reading anything on the display. ### Usually leads to Ice maker water inlet valve repair The electric valve that lets water into the ice maker, tested and replaced when it will not open, opens only partway, or keeps dripping after it should have closed. ### Shows up as Ice Maker Making Small or Hollow Cubes The ice maker making small cubes, thin crescents, hollow shells with water inside or fragments that break apart in the bin tells you the mold is not getting a full fill. ### Make Sub-Zero Sub-Zero ice maker service, for ice makers in built-in units and those under the counter. ### Source Sub-Zero answer: Classic built-in error code 50 U 86 Sub-Zero Classic (BI) built-in models with a water flow meter. ## Before you book, in this order. Each step comes from Sub-Zero's own guidance for 50 U 86 on its ice makers. Follow it to the end: the last card says whether this is a visit. 01 Check that the shutoff valve to the unit is fully open and the supply line is not kinked behind the unit. 02 Replace the water filter if it is past its interval. 03 Switch the unit's home breaker off for 30 seconds and back on; book a visit if 50 U 86 returns. ### Still there? It usually turns into [ice maker water inlet valve repair](https://icemakerrepair.center/services/water-inlet-valve-repair/). Book with the code and the model number. ### What not to do 50 U 86 is not a report that water has stopped entirely. It describes weak flow, not no flow. ## What you may notice with it. The ice maker problems 50 U 86 tends to arrive with. Answer these at the ice maker before anyone is booked. [All problems](https://icemakerrepair.center/problems/) Before you call ### [Ice Maker Making Small or Hollow Cubes](https://icemakerrepair.center/problems/ice-maker-making-small-or-hollow-cubes/) [All 6 causes, cheapest first](https://icemakerrepair.center/problems/ice-maker-making-small-or-hollow-cubes/) It also comes with - [**No Ice Coming From the Ice Maker**](https://icemakerrepair.center/problems/ice-maker-not-making-ice/) - [**Ice Maker Error Code**](https://icemakerrepair.center/problems/ice-maker-error-code/) Problem ### Ice Maker Making Small or Hollow Cubes 6 causes, cheapest first Where 50 U 86 usually leads ## Ice maker water inlet valve repair. **Water inlet valve and its fittings · low to moderate.** Book a visit [What the job involves](https://icemakerrepair.center/services/water-inlet-valve-repair/) ## 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 87](https://icemakerrepair.center/error-codes/sub-zero-50-u-87/) [ICE flashing blue](https://icemakerrepair.center/error-codes/sub-zero-ice-flashing-blue/) [All 15 Sub-Zero codes](https://icemakerrepair.center/error-codes/#codes-sub-zero) Water supply and fill on other makes [Café Making Ice and Filter lights flashing alternately](https://icemakerrepair.center/error-codes/cafe-making-ice-and-filter-lights-flashing-alternately/) [GE Profile Leak Detected](https://icemakerrepair.center/error-codes/ge-profile-leak-detected/) [GE Leak Detected](https://icemakerrepair.center/error-codes/ge-leak-detected/) [JennAir Replace Filter light flashing](https://icemakerrepair.center/error-codes/jennair-replace-filter-light-flashing/) [Kenmore Er gF](https://icemakerrepair.center/error-codes/kenmore-er-gf/) [KitchenAid Replace Filter light flashing](https://icemakerrepair.center/error-codes/kitchenaid-replace-filter-light-flashing/) [LG gF](https://icemakerrepair.center/error-codes/lg-gf/) [Liebherr IceMaker ON/OFF lamp flashing](https://icemakerrepair.center/error-codes/liebherr-icemaker-lamp-flashing/) [All 36 codes of this kind](https://icemakerrepair.center/error-codes/#family-water) 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 > Water flow meter detected low flow [Sub-Zero answer: Classic built-in error code 50 U 86](https://www.subzero-wolf.com/assistance/answers/sub-zero/classic/built-in-series-error-code-50-u-86) [Sub-Zero answer: Classic built-in error code 50 U 86](https://www.subzero-wolf.com/assistance/answers/sub-zero/classic/built-in-series-error-code-50-u-86) Every code on this site is taken from the manufacturer's documentation, never from a forum or a parts listing. Sub-Zero Classic (BI) built-in models with a water flow meter. ## Sub-Zero 50 U 86 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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Check that the shutoff valve to the unit is fully open and the supply line is not kinked behind the unit. If it comes back, it needs a visit. ### What usually causes 50 U 86 on a Sub-Zero? Anything that slows water on its way in: a partly closed shutoff, a pinched line, a clogged filter or low house pressure. The meter reads the result as low flow. ### Will 50 U 86 make my Sub-Zero cubes smaller? It can, because the ice maker gets less water in its fill window. Small or hollow cubes alongside 50 U 86 point at the same restriction. ### Is 50 U 86 different from 50 U 87 on a Sub-Zero? Yes. 50 U 86 means some water flows, just too little; 50 U 87 means the meter saw no flow at all. --- **[Read on the site: Sub-Zero 50 U 86: the flow meter measured low water flow](https://icemakerrepair.center/error-codes/sub-zero-50-u-86/)** **[Book a visit with IceMakerRepair.center](https://icemakerrepair.center/schedule/)**