--- title: "U-Line refrigerator showing Zone T Open" description: "What Zone T Open means on U-Line refrigerators, what to check before booking, and when it is not a failure at all." url: "https://refrigeratorrepair.center/error-codes/u-line-zone-t-open/" --- # U-Line refrigerator showing Zone T Open The thermistor circuit for a zone reads as open. ## What Zone T Open actually means. The thermistor circuit for a zone reads as open. The thermistor is the sensor the control uses for that zone's temperature. On dual-zone units, L or R shows which side. U-Line gives no owner fix for this; the answer is to contact customer care. U-Line refrigerator display · also shown as L Zone T Open, R Zone T Open, (L) Zone T Open, (R) Zone T Open What to do when Zone T Open shows on the refrigerator ### Kind of code Sensor circuit A temperature sensor reading outside its range, or the wiring to it. The reading is confirmed with a meter before any part is ordered. ### Usually leads to Controls and sensors A refrigerator cools to what it believes the temperature is, and a sensor reading wrong is obeyed perfectly. ### Shows up as Refrigerator Freezing Food Lettuce frozen solid and milk with ice in it, in a compartment that is not supposed to freeze. ### Make U-Line Undercounter refrigeration, ice machines, wine cabinets and beverage centers — almost nothing full-height. ### Source U-Line User Guide & Service Manual, model U-3036RRINT-00B (3000 Series), "Error Notification" table (u-line.com PDF) U-Line 3000 Series units that show the Error Notification text on the display. On single-zone models the (L) or (R) prefix is left out. ## Before you book, in this order. Each step comes from U-Line's own guidance for Zone T Open on its refrigerators. Follow it to the end: the last card says whether this is a visit. 01 Note which zone is named, L or R, and the exact wording. 02 Check the real temperature in that zone with a bottle of water and an accurate thermometer left in for 24 hours, as U-Line describes. 03 Contact U-Line Customer Care. ### Still there? It usually turns into [controls and sensors](https://refrigeratorrepair.center/services/controls-and-sensors/). Book with the code and the model number. ### What not to do It is not the same as Zone T Short. Open and shorted are two different readings from the same sensor circuit. ## What you may notice with it. The refrigerator problems Zone T Open tends to arrive with. Answer these at the refrigerator before anyone is booked. [All problems](https://refrigeratorrepair.center/problems/) Before you call ### [Refrigerator Freezing Food](https://refrigeratorrepair.center/problems/refrigerator-too-cold/) [All 5 causes, cheapest first](https://refrigeratorrepair.center/problems/refrigerator-too-cold/) It also comes with - [**Refrigerator Not Cooling**](https://refrigeratorrepair.center/problems/refrigerator-not-cooling/) Problem ### Refrigerator Freezing Food 5 causes, cheapest first Where Zone T Open usually leads ## Controls and sensors. **Control board · moderate.** Book a visit [What the job involves](https://refrigeratorrepair.center/services/controls-and-sensors/) ## Read these before the visit. Short guides that make the call quicker and the diagnosis cheaper. [All guides](https://refrigeratorrepair.center/guides/) What you can check yourself ### Five observations that narrow a refrigerator problem down before anyone visits What you can check yourself ### Where the model number hides, and why nothing works without it Error codes ### All 247 codes, by make ## U-Line refrigerators. Undercounter refrigeration, ice machines, wine cabinets and beverage centers — almost nothing full-height. [U-Line refrigerator repair](https://refrigeratorrepair.center/brands/u-line/) More U-Line codes [No Comm](https://refrigeratorrepair.center/error-codes/u-line-no-comm/) [Zone T Short](https://refrigeratorrepair.center/error-codes/u-line-zone-t-short/) [Amb Thrm Open](https://refrigeratorrepair.center/error-codes/u-line-amb-thrm-open/) [Temp Hi 6H+](https://refrigeratorrepair.center/error-codes/u-line-temp-hi-6h/) [Temp Lo 6H+](https://refrigeratorrepair.center/error-codes/u-line-temp-lo-6h/) [Door Open 5M](https://refrigeratorrepair.center/error-codes/u-line-door-open-5m/) [ºF / ºC symbol flashing](https://refrigeratorrepair.center/error-codes/u-line-f-c-symbol-flashing/) Sensor circuit on other makes [Samsung 5E](https://refrigeratorrepair.center/error-codes/samsung-5e/) [LG ER rS](https://refrigeratorrepair.center/error-codes/lg-er-rs/) [Sub-Zero 10 R 00](https://refrigeratorrepair.center/error-codes/sub-zero-10-r-00/) [Viking E3](https://refrigeratorrepair.center/error-codes/viking-e3/) [Gaggenau Sensor fault](https://refrigeratorrepair.center/error-codes/gaggenau-sensor-warning/) [Miele F114](https://refrigeratorrepair.center/error-codes/miele-f114/) [Frigidaire OP](https://refrigeratorrepair.center/error-codes/frigidaire-op/) [Bertazzoni E1](https://refrigeratorrepair.center/error-codes/bertazzoni-e1/) [All 50 codes of this kind](https://refrigeratorrepair.center/error-codes/#family-sensor-circuit) U-Line builds this ### Undercounter refrigerator A single 15 to 24 inch unit under the worktop — front-vented, tightly enclosed, and easily starved of air. ## In U-Line's own words > (L) (R) Zone T Open Left or right zone thermistor circuit open. Contact Customer Care. [U-Line User Guide & Service Manual, model U-3036RRINT-00B (3000 Series), "Error Notification" table (u-line.com PDF)](https://www.u-line.com/userguide/pdf/index/sku/U-3036RRINT-00B/) [U-Line User Guide & Service Manual, model U-3036RRINT-00B (3000 Series), "Error Notification" table (u-line.com PDF)](https://www.u-line.com/userguide/pdf/index/sku/U-3036RRINT-00B/) Every code on this site is taken from the manufacturer's documentation, never from a forum or a parts listing. U-Line 3000 Series units that show the Error Notification text on the display. On single-zone models the (L) or (R) prefix is left out. ## U-Line Zone T Open refrigerator 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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Note which zone is named, L or R, and the exact wording. If it comes back, it needs a visit. ### Can I reset Zone T Open on my U-Line? U-Line lists no owner fix; the instruction is to contact customer care. Before calling, note whether it names the L or R zone. That tells the technician which sensor circuit reads open. ### How do I know my U-Line zone is still at the right temperature with Zone T Open showing? Leave a bottle of water with an accurate thermometer in that zone for 24 hours, as U-Line describes. The display may not reflect the real temperature while the sensor circuit is open. Zone T Short is a different reading from the same circuit. --- **[Read on the site: U-Line refrigerator showing Zone T Open](https://refrigeratorrepair.center/error-codes/u-line-zone-t-open/)** **[Book a visit with RefrigeratorRepair.center](https://refrigeratorrepair.center/schedule/)**