--- title: "Sub-Zero 40 8 40: the ice maker filled for the full time and still came up short" description: "What 40 8 40 means on Sub-Zero 40 8 40: the ice maker filled for the full time and still came up shorts, what to check before booking, and when it is not a…" url: "https://icemakerrepair.center/error-codes/sub-zero-40-8-40/" --- # Sub-Zero 40 8 40: the ice maker filled for the full time and still came up short On Classic (BI) built-in models, 40 8 40 means the ice maker filled for its maximum time without reaching the volume it needs. ## What 40 8 40 actually means. On Classic (BI) built-in models, 40 8 40 means the ice maker filled for its maximum time without reaching the volume it needs. Low pressure, a clogged filter or a partly frozen fill tube can all slow the water reaching the mold, which leaves small or hollow cubes or none at all. Sub-Zero ice maker display · also shown as 40-8-40, 40840 What to do when 40 8 40 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 40 8 40 Sub-Zero Classic (BI) built-in models with an ice maker and flow sensing. ## Before you book, in this order. Each step comes from Sub-Zero's own guidance for 40 8 40 on its ice makers. Follow it to the end: the last card says whether this is a visit. 01 Make sure the water shutoff to the unit is fully open and the supply line has no kinks. 02 Replace the water filter if it is due, then switch the unit's home breaker off for 30 seconds and back on. 03 Book a visit if 40 8 40 returns, especially if cubes stay small. ### 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 40 8 40 does not mean water is overflowing. It is the reverse: too little water arrived in the time allowed. ## What you may notice with it. The ice maker problems 40 8 40 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 - [**Ice Maker Fill Tube Frozen**](https://icemakerrepair.center/problems/ice-maker-fill-tube-frozen/) - [**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 40 8 40 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 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/) [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 > Ice maker ran for maximum fill time without achieving necessary volume [Sub-Zero answer: Classic built-in error code 40 8 40](https://www.subzero-wolf.com/assistance/answers/sub-zero/classic/built-in-series-error-code-40-8-40) [Sub-Zero answer: Classic built-in error code 40 8 40](https://www.subzero-wolf.com/assistance/answers/sub-zero/classic/built-in-series-error-code-40-8-40) 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 an ice maker and flow sensing. ## Sub-Zero 40 8 40 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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Make sure the water shutoff to the unit is fully open and the supply line has no kinks. If it comes back, it needs a visit. ### Why are my Sub-Zero cubes small after 40 8 40? The mold is not getting a full measure of water within the fill time. Small or hollow cubes are the usual sign of the same restricted flow the code reports. ### Can a frozen fill tube cause 40 8 40 on a Sub-Zero? A partly frozen fill tube slows water to the mold, which is one way the fill can time out short. A technician checks the tube, the valve and the flow before replacing parts. ### Does a new water filter fix 40 8 40 on a Sub-Zero? It can if the old filter was clogged. If the code returns with a fresh filter and an open supply valve, the restriction is elsewhere. --- **[Read on the site: Sub-Zero 40 8 40: the ice maker filled for the full time and still came up short](https://icemakerrepair.center/error-codes/sub-zero-40-8-40/)** **[Book a visit with IceMakerRepair.center](https://icemakerrepair.center/schedule/)**