--- title: "Sub-Zero 50 U 87: no water flow detected" description: "What 50 U 87 means on Sub-Zero 50 U 87: no water flow detecteds, what to check before booking, and when it is not a failure at all." url: "https://icemakerrepair.center/error-codes/sub-zero-50-u-87/" --- # Sub-Zero 50 U 87: no water flow detected On Classic (BI) built-in models, 50 U 87 means the water flow meter did not detect any flow. ## What 50 U 87 actually means. On Classic (BI) built-in models, 50 U 87 means the water flow meter did not detect any flow. Sub-Zero's first suspect is house water pressure, since a recent pressure drop can bring the code on; without flow the ice maker cannot fill. Sub-Zero ice maker display · also shown as 50-U-87, 50U87 What to do when 50 U 87 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 No Ice Coming From the Ice Maker The mold sits empty or holds one frozen batch that never drops, the bin stays bare for days, and the dispenser gives water as usual: an ice maker not making ice while the rest of the appliance carries on normally. ### 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 87 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 87 on its ice makers. Follow it to the end: the last card says whether this is a visit. 01 Confirm water pressure in the house is normal and that the shutoff valve to the unit is open. 02 Switch the unit's home breaker off for 30 seconds and back on. 03 Book a visit if 50 U 87 returns with water pressure confirmed. ### 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 87 does not by itself mean the ice maker is broken. It says water never arrived, so the supply comes first. ## What you may notice with it. The ice maker problems 50 U 87 tends to arrive with. Answer these at the ice maker before anyone is booked. [All problems](https://icemakerrepair.center/problems/) Before you call ### [No Ice Coming From the Ice Maker](https://icemakerrepair.center/problems/ice-maker-not-making-ice/) [All 7 causes, cheapest first](https://icemakerrepair.center/problems/ice-maker-not-making-ice/) It also comes with - [**Ice Dispenser Not Working**](https://icemakerrepair.center/problems/ice-dispenser-not-working/) - [**Ice Maker Error Code**](https://icemakerrepair.center/problems/ice-maker-error-code/) Problem ### No Ice Coming From the Ice Maker 7 causes, cheapest first Where 50 U 87 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 86](https://icemakerrepair.center/error-codes/sub-zero-50-u-86/) [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 did not detect flow [Sub-Zero answer: Classic built-in error code 50 U 87](https://www.subzero-wolf.com/assistance/answers/sub-zero/classic/built-in-series-error-code-50-u-87) [Sub-Zero answer: Classic built-in error code 50 U 87](https://www.subzero-wolf.com/assistance/answers/sub-zero/classic/built-in-series-error-code-50-u-87) 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 87 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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Confirm water pressure in the house is normal and that the shutoff valve to the unit is open. If it comes back, it needs a visit. ### Can plumbing work in the house trigger 50 U 87 on a Sub-Zero? Yes. If the water was shut off or pressure dropped during other work, the meter may have seen no flow. Sub-Zero names recent pressure drops as a cause. ### How do I check water pressure for my Sub-Zero? Run the dispenser or a nearby faucet and see whether the flow is strong and steady. Sub-Zero publishes a separate guide for confirming pressure; a weak or absent flow points at the supply. ### If water pressure is fine, what does 50 U 87 on a Sub-Zero point to? Then the valve, the filter head, a frozen line or the flow meter itself need testing, which is a job for a technician. --- **[Read on the site: Sub-Zero 50 U 87: no water flow detected](https://icemakerrepair.center/error-codes/sub-zero-50-u-87/)** **[Book a visit with IceMakerRepair.center](https://icemakerrepair.center/schedule/)**