--- title: "U-Line refrigerator showing Amb Thrm Open" description: "What Amb Thrm 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-amb-thrm-open/" --- # U-Line refrigerator showing Amb Thrm Open The ambient thermistor circuit is open. ## What Amb Thrm Open actually means. The ambient thermistor circuit is open. That sensor reads the room around the unit, not the inside of the cabinet. U-Line's instruction is to contact customer care. U-Line refrigerator display What to do when Amb Thrm 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 Amb Thrm Open on its refrigerators. Follow it to the end: the last card says whether this is a visit. 01 Write down the message and the model number. 02 Check that the cabinet is still holding its set temperature. 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 a zone sensor message. Those read Zone T Open or Zone T Short. If the display shows Amb Thrm Short instead, the same sensor's circuit is shorted rather than open. ## What you may notice with it. The refrigerator problems Amb Thrm 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 Amb Thrm 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 Open](https://refrigeratorrepair.center/error-codes/u-line-zone-t-open/) [Zone T Short](https://refrigeratorrepair.center/error-codes/u-line-zone-t-short/) [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 > Amb Thrm Open Ambient 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/) 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 Amb Thrm 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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Write down the message and the model number. If it comes back, it needs a visit. ### Does Amb Thrm Open mean my U-Line cabinet is warming? Not by itself. The ambient thermistor reads the room around the unit, not the inside. Confirm the cabinet is still at its set temperature and then contact customer care. ### What is the difference between Amb Thrm Open and Amb Thrm Short on a U-Line? Both concern the same ambient sensor: open means its circuit reads broken, short means it reads shorted. Zone sensors report under Zone T Open or Zone T Short instead. Either ambient message goes to U-Line Customer Care. --- **[Read on the site: U-Line refrigerator showing Amb Thrm Open](https://refrigeratorrepair.center/error-codes/u-line-amb-thrm-open/)** **[Book a visit with RefrigeratorRepair.center](https://refrigeratorrepair.center/schedule/)**