--- title: "U-Line E1 in the error log: thermistor 1 reads open" description: "What E1 means on U-Line E1 in the error log: thermistor 1 reads opens, what to check before booking, and when it is not a failure at all." url: "https://icemakerrepair.center/error-codes/u-line-e1/" --- # U-Line E1 in the error log: thermistor 1 reads open On U-Line's clear ice and craft ice models, E1 in the service error log means thermistor 1 reads as an open circuit. ## What E1 actually means. On U-Line's clear ice and craft ice models, E1 in the service error log means thermistor 1 reads as an open circuit. U-Line's list names the sensor only by number; the manual's thermistor section describes a sensor on the right side wall of the ice bin that controls the ice level. U-Line ice maker display What to do when E1 shows on the ice maker ### Kind of code Temperature sensors The control lost track of how cold the ice mold or the ice compartment is, because a thermistor reads nonsense or its wire lost contact. Without that reading the ice maker cannot tell when a batch is frozen, so it stops or harvests at the wrong time. Frost packed around the sensor and a loose plug are checked before the sensor itself is changed. ### Usually leads to Ice maker control and sensor repair The control board, the thermistors, the bin sensor and the wiring that decide when an ice maker fills, freezes and stops, tested and repaired when a light flashes, a code shows, a breaker trips or the ice never stops coming. ### Shows up as Ice Maker Making Too Much Ice The ice maker making too much ice overfills the bin, pushes cubes into the chute, jams the door ice compartment or keeps the freezer drawer from closing. ### Make U-Line U-Line undercounter ice maker service, including cleaning, descaling and drain repair. ### Source U-Line User Guide & Service Manual, UHCL115 15-inch clear ice model (u-line.com PDF) U-Line 15-inch clear ice (HCL, OCL, ACP) and craft ice (RCC) models. U-Line says all errors are logged in memory, but only the door error shows on the display with a tone; the others are read from the error log in service mode. ## Before you book, in this order. Each step comes from U-Line's own guidance for E1 on its ice makers. Follow it to the end: the last card says whether this is a visit. 01 Note the code and the model number from the plate inside the unit. 02 Switch the unit off and back on once to see whether ice making resumes normally. 03 Book a visit so the thermistor and its connector can be measured. ### Still there? It usually turns into [ice maker control and sensor repair](https://icemakerrepair.center/services/ice-maker-control-and-sensor-repair/). Book with the code and the model number. ### What not to do E1 is not a water or drain problem. It concerns a temperature sensor circuit, and the owner will not see it on the display unless it is read from the log. ## What you may notice with it. The ice maker problems E1 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 Too Much Ice](https://icemakerrepair.center/problems/ice-maker-making-too-much-ice/) [All 5 causes, cheapest first](https://icemakerrepair.center/problems/ice-maker-making-too-much-ice/) It also comes with - [**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 Too Much Ice 5 causes, cheapest first Where E1 usually leads ## Ice maker control and sensor repair. **Control board, thermistor or bin sensor · moderate to highest.** Book a visit [What the job involves](https://icemakerrepair.center/services/ice-maker-control-and-sensor-repair/) ## U-Line ice makers. U-Line undercounter ice maker service, including cleaning, descaling and drain repair. [U-Line ice maker repair](https://icemakerrepair.center/brands/u-line/) More U-Line codes [dr](https://icemakerrepair.center/error-codes/u-line-dr/) [E5](https://icemakerrepair.center/error-codes/u-line-e5/) [E11](https://icemakerrepair.center/error-codes/u-line-e11/) [E12](https://icemakerrepair.center/error-codes/u-line-e12/) [P1](https://icemakerrepair.center/error-codes/u-line-p1/) [Er15](https://icemakerrepair.center/error-codes/u-line-er15/) [Er16](https://icemakerrepair.center/error-codes/u-line-er16/) [Er01](https://icemakerrepair.center/error-codes/u-line-er01/) [Er03](https://icemakerrepair.center/error-codes/u-line-er03/) [Er25](https://icemakerrepair.center/error-codes/u-line-er25/) Temperature sensors on other makes [Bertazzoni EE](https://icemakerrepair.center/error-codes/bertazzoni-ee/) [Kenmore Er IS](https://icemakerrepair.center/error-codes/kenmore-er-is/) [LG IS](https://icemakerrepair.center/error-codes/lg-is/) [Samsung 8E](https://icemakerrepair.center/error-codes/samsung-8e/) [True Residential E1](https://icemakerrepair.center/error-codes/true-e1/) [Viking NO WATER and DRAIN lamps blinking](https://icemakerrepair.center/error-codes/viking-no-water-and-drain-lamps-blinking/) [All 14 codes of this kind](https://icemakerrepair.center/error-codes/#family-sensor) U-Line 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 U-Line's own words > E1: Thermistor 1 open. [U-Line User Guide & Service Manual, UHCL115 15-inch clear ice model (u-line.com PDF)](https://www.u-line.com/userguide/pdf/index/sku/UHCL115-BS01A/) [U-Line User Guide & Service Manual, UHCL115 15-inch clear ice model (u-line.com PDF)](https://www.u-line.com/userguide/pdf/index/sku/UHCL115-BS01A/) [U-Line User Guide & Service Manual, UHCL115 15-inch clear ice model (u-line.com PDF)](https://www.u-line.com/userguide/pdf/index/sku/UHCL115-BS01A/) Every code on this site is taken from the manufacturer's documentation, never from a forum or a parts listing. U-Line 15-inch clear ice (HCL, OCL, ACP) and craft ice (RCC) models. U-Line says all errors are logged in memory, but only the door error shows on the display with a tone; the others are read from the error log in service mode. ## U-Line E1 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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Note the code and the model number from the plate inside the unit. If it comes back, it needs a visit. ### How do I see E1 on a U-Line ice maker if the display does not show it? E1 lives in the error log, which is read in the control's service mode. Most owners only learn about it when a technician pulls the log. ### What does an open thermistor do to a U-Line clear ice maker? The control loses a temperature reading it relies on. If that sensor is the one that judges the ice level, the unit may stop early or keep making ice when the bin is already full. ### Can a dirty connector cause E1 on a U-Line? Yes. U-Line notes that dirty thermistor connections can change the readings, which is why it greases those connectors and suggests replacing the thermistor and harness when a connection is dirty. --- **[Read on the site: U-Line E1 in the error log: thermistor 1 reads open](https://icemakerrepair.center/error-codes/u-line-e1/)** **[Book a visit with IceMakerRepair.center](https://icemakerrepair.center/schedule/)**