--- title: "Sub-Zero error code 15-U-11" description: "Sub-Zero error code 15-U-11: water check valve — relay — closed. What the code covers, what it usually points at on built-in refrigeration, and what to do…" url: "https://subzeromiami.support/error-codes/error-code-15-u-11/" date_modified: "2026-08-18" Product line: "Classic" --- # Sub-Zero error code 15-U-11 Error code # Sub-Zero error code 15-U-11 Sub-Zero error code 15-U-11: water check valve — relay — closed. What the code covers, what it usually points at on built-in refrigeration, and what to do about it. - **From $95** diagnostic, credited to the repair - **59** cities and neighborhoods covered - **OEM** parts available on order - **In writing** the price, before anything is opened ## Book a diagnostic visit Your model number and a line about what it is doing is enough to get started. Your details stay private. No spam, ever. What we can confirm ## Code 15-U-11, from the manufacturer’s own pages A code is only meaningful together with the generation showing it — the same two digits mean different things across generations, and that is the commonest reason a code looked up online leads somewhere wrong. This one is recorded on [Classic](https://subzeromiami.support/series/classic/). The code 15-U-11 Water check valve — relay — closed or call [(305) 570-1472](tel:+13055701472) What it narrows down to Water check valve · relay What you are probably seeing [Ice maker not working](https://subzeromiami.support/symptoms/ice-maker-not-working/) Diagnostic From $95, credited to the repair What it looks like from the kitchen ## The symptom this code usually arrives with A code names the subsystem; the symptom is what sent you to look at the display in the first place. That page says what it usually turns out to be, cheapest cause first. - Ice maker not working Production that stopped, or halved over a season. Water supply, the freeze cycle and the condenser are the three places this ends up, and they are easy to tell apart. Stopped after a filter change Half the ice it used to make Cloudy cubes instead of clear [ What it usually means ](https://subzeromiami.support/symptoms/ice-maker-not-working/) Production that stopped, or halved over a season. Water supply, the freeze cycle and the condenser are the three places this ends up, and they are easy to tell apart. - Stopped after a filter change - Half the ice it used to make - Cloudy cubes instead of clear On the same generation ## What else belongs to the Classic A code belongs to a generation rather than to one cabinet. These are the other codes yours can show, and the models that can show this one — a display often has more than one thing to say, and the model number decides what any of it costs to put right. Other codes this generation can display Sensor range - [10-1-01](https://subzeromiami.support/error-codes/error-code-10-1-01/) - [10-1-02](https://subzeromiami.support/error-codes/error-code-10-1-02/) - [10-2-00](https://subzeromiami.support/error-codes/error-code-10-2-00/) - [10-2-01](https://subzeromiami.support/error-codes/error-code-10-2-01/) - [10-2-02](https://subzeromiami.support/error-codes/error-code-10-2-02/) - [10-3-00](https://subzeromiami.support/error-codes/error-code-10-3-00/) - [10-3-01](https://subzeromiami.support/error-codes/error-code-10-3-01/) - [10-3-02](https://subzeromiami.support/error-codes/error-code-10-3-02/) Older-series code - [L0-C](https://subzeromiami.support/error-codes/error-code-l0-c/) - [H2-LO](https://subzeromiami.support/error-codes/error-code-h2-lo/) Freezer · load or component - [60-202](https://subzeromiami.support/error-codes/error-code-60-202/) - [60-238](https://subzeromiami.support/error-codes/error-code-60-238/) The same two digits mean different things across generations. [ Search the full code list ](https://subzeromiami.support/error-codes/) In more detail ## About Sub-Zero error code 15-U-11 ### What 15-U-11 tells you On the series that display it, 15-U-11 is logged against the water check valve — relay — closed. That narrows the diagnosis to one subsystem, which is genuinely useful — it does not, on its own, say which part in that subsystem has moved out of range. Codes in the 10s are sensor and thermistor territory: a temperature reading that has gone open, shorted or implausible. The sensor itself is often the cheap end of the repair — but the same code appears when the wiring to it has been disturbed. The same digits mean different things across generations, so 15-U-11 on one series and 15-U-11 on another are not the same conversation — the number on the data plate is what separates them, and the [model pages](https://subzeromiami.support/models/) say what each generation means for a repair. [The code index](https://subzeromiami.support/error-codes/) covers how the codes are structured, what to photograph before you call, and the questions we are asked about them. This article is based on: - Official manufacturer documentation - Internal repair procedures - Technician repair history - Company quality standards ## Tell us the model number and what it is doing. --- **[Read full article: Sub-Zero error code 15-U-11](https://subzeromiami.support/error-codes/error-code-15-u-11/)**