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Error code reference

U-Line Refrigerator Error Code E8

Thermistor 3 open or shorted

U-Line codesU-Line refrigerator codes

Thermistor 3 open or shorted. Not available on Rs, WCs, or CLR2160.

First step from the service manual

Replace thermistor. Check for thermistor errors by accessing 'View thermistor # status (2, 19, 20, or 21).' If the error code is repeated, the thermistor is open or shorted.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What E8 means on a U-Line refrigerator

The E8 error code on a U-Line refrigerator indicates a fault with Thermistor 3, which has been detected as either open or shorted. A thermistor is a temperature-sensing resistor whose electrical resistance changes predictably with temperature. When the control board reads a resistance value that falls outside the expected range for Thermistor 3, it interprets that signal as either an open circuit (no continuity, suggesting a broken wire or failed sensor) or a short circuit (abnormally low resistance, suggesting a wiring fault or internally failed thermistor). This fault prevents the refrigerator from accurately monitoring temperatures in the zone that Thermistor 3 is assigned to monitor.

Diagnosing E8 begins with accessing the unit's diagnostic menu and navigating to the thermistor status view, specifically checking positions 2, 19, 20, or 21 depending on the model configuration. If the error repeats after inspection, the thermistor itself is the most likely failed component and should be replaced. It is important to note that E8 is not applicable to RS, WC, or CLR2160 model lines, so technicians should first confirm the unit model before proceeding with this diagnostic path. Wiring between the thermistor and the control board should also be inspected for pinched, corroded, or disconnected connectors, as these can mimic a failed thermistor and produce the same open or shorted fault condition.

Source: manufacturer service documentation.

Common causes of E8

  1. 01

    Failed Thermistor 3 sensor

    Part replacement

    The thermistor itself has failed internally, producing a resistance value that is either too high (open) or too low (shorted) for the control board to interpret. Replacing the thermistor is the primary recommended corrective action.

  2. 02

    Broken or disconnected wiring

    Wiring / connection

    A wire leading to Thermistor 3 may be broken, pinched, or pulled free from its connector, creating an open circuit condition. Visually inspecting the thermistor harness and connector for damage or looseness can identify this issue.

  3. 03

    Corroded or contaminated connector

    Wiring / connection

    Moisture or oxidation at the thermistor connector can increase resistance enough to trigger an open fault. Cleaning the connector contacts or replacing the connector may restore proper communication.

  4. 04

    Shorted wiring harness

    Wiring / connection

    If two conductors in the thermistor wiring harness contact each other due to damaged insulation, the control board reads an abnormally low resistance and flags a shorted thermistor fault. Inspecting the harness routing for chafing or insulation wear can help identify this cause.

  5. 05

    Control board fault

    Part replacement

    In rare cases, the control board's thermistor input circuit may malfunction, causing it to misread a functioning thermistor as open or shorted. This is typically considered only after the thermistor and wiring have been confirmed good.

See the test procedure for each cause

Frequently asked questions about E8

What does E8 mean on a U-Line refrigerator?
E8 indicates that Thermistor 3 has been detected as either open or shorted by the control board. This means the temperature sensor is either not completing a circuit or is sending an out-of-range resistance reading. The refrigerator cannot accurately monitor the temperature zone associated with this sensor until the fault is resolved. Note that this code does not apply to RS, WC, or CLR2160 model lines.
How do I fix the E8 error on my U-Line refrigerator?
Start by accessing the diagnostic menu and checking the thermistor status at positions 2, 19, 20, or 21 to confirm the fault. Inspect the wiring and connector leading to Thermistor 3 for any visible damage, corrosion, or loose connections. If the error persists after those checks, replacing Thermistor 3 is the recommended repair. In rare cases where a new thermistor does not clear the code, the control board may need evaluation.
Will resetting my U-Line refrigerator clear the E8 error code?
A reset may temporarily clear the E8 code from the display, but if the underlying fault with Thermistor 3 has not been corrected, the error will return. The control board will continue to detect the open or shorted condition each time it reads the sensor. A lasting fix requires repairing or replacing the faulty thermistor or wiring.
Is the E8 error on a U-Line refrigerator a safety concern?
An E8 fault means the refrigerator may not be accurately tracking temperatures in the zone monitored by Thermistor 3. If that zone contains perishable food or beverages, there is a risk that temperatures could drift outside safe storage ranges without triggering a proper response from the control board. It is advisable to monitor the unit closely and address the repair promptly.
How much does it cost to repair the E8 error on a U-Line refrigerator?
If the repair only requires a thermistor replacement, parts typically range from around $20 to $60 depending on the specific sensor, with professional labor adding $75 to $150 or more depending on your location. If the wiring harness or control board also needs attention, total repair costs can increase to the $150 to $400 range. Getting a diagnostic assessment from a qualified technician before ordering parts is a good way to avoid unnecessary expense.

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