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Error code reference

U-Line Freezer Error Code (L) (R) Evap T Short

Left or right evaporator thermistor circuit shorted.

U-Line codesU-Line freezer codes

Left or right evaporator thermistor circuit shorted.

First step from the service manual

Inspect thermistor cable for pinch points or damage. Replace if necessary.

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

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What (L) (R) Evap T Short means on a U-Line freezer

The (L) (R) Evap T Short error on a U-Line freezer indicates that the evaporator thermistor circuit on either the left or right side has shorted. Thermistors are temperature-sensing resistors that monitor evaporator coil temperatures and send that data back to the control board. When a short circuit occurs in this circuit, the thermistor or its wiring is conducting resistance far outside the expected range, typically reading near zero ohms instead of the several thousand ohms expected at normal operating temperatures. The control board interprets this abnormal resistance as a fault condition and logs the error.

The evaporator thermistor plays a critical role in regulating the refrigeration cycle. It helps the control board determine when the evaporator is operating within safe thermal limits and influences defrost cycle timing. A shorted thermistor can cause the freezer to behave erratically, run continuous cooling cycles, or fail to defrost properly, which may lead to frost accumulation on the evaporator coils.

The most common physical causes of a shorted thermistor circuit include damaged wiring from pinch points where the cable passes through cabinet panels or around internal components, moisture intrusion into the connector or sensor body, and physical damage from ice buildup pressing against the cable. Because the first diagnostic step specifically calls for inspecting the thermistor cable for pinch points or damage, technicians should carefully trace the full length of the wiring harness before condemning the thermistor sensor itself.

Source: manufacturer service documentation.

Common causes of (L) (R) Evap T Short

  1. 01

    Pinched or kinked thermistor cable

    Part replacement

    The thermistor wiring can become pinched where it routes through cabinet panels or around internal components. A pinched cable creates a short circuit by forcing the insulated conductors together, which should be the first area inspected.

  2. 02

    Physical damage to the thermistor cable

    Part replacement

    Cuts, abrasions, or crushing from ice buildup can compromise the cable insulation and cause a short. Inspect the full length of the cable for visible breaks, worn insulation, or discoloration.

  3. 03

    Moisture or ice intrusion at the connector

    Wiring / connection

    Water or ice entering the thermistor connector can create a conductive path between terminals, mimicking a short circuit. Check the connector for corrosion, water residue, or ice blockage.

  4. 04

    Failed thermistor sensor

    Part replacement

    The thermistor sensor itself can fail internally, causing its resistance to drop to near zero ohms. If the cable and connector check out visually, measure the thermistor resistance and compare it to the expected value at a known temperature.

  5. 05

    Control board fault misreading the circuit

    Part replacement

    In rare cases, the control board input circuit may develop a fault that causes it to misinterpret a normal thermistor reading as a short. This should only be considered after the thermistor and wiring have been confirmed good.

See the test procedure for each cause

Frequently asked questions about (L) (R) Evap T Short

What does (L) (R) Evap T Short mean on a U-Line freezer?
This error code means the control board has detected a short circuit in the evaporator thermistor circuit on either the left or right side of the freezer. The thermistor is a resistive temperature sensor that monitors the evaporator coil. When its resistance drops abnormally low due to a wiring fault or sensor failure, the board flags this code. The freezer may not cool or defrost correctly while this fault is active.
How do I fix the (L) (R) Evap T Short error on my U-Line freezer?
Start by unplugging the freezer and carefully inspecting the thermistor cable for any pinch points, cuts, or areas where the insulation is worn. Pay close attention to where the cable passes through panels or around internal components. If the cable appears damaged, it should be replaced. If the cable looks intact, check the connector for moisture or corrosion and test the thermistor sensor resistance directly with a multimeter.
Is it safe to continue using my U-Line freezer when this error is displayed?
Continuing to run the freezer with this error is not recommended for long periods. A shorted evaporator thermistor can cause the control board to mismanage the refrigeration and defrost cycles, which may result in excessive frost buildup, inadequate cooling, or food spoilage. Addressing the fault promptly helps prevent further component damage.
Will resetting the freezer clear the (L) (R) Evap T Short error?
A power reset may temporarily clear the error from the display, but the code will return if the underlying short circuit in the thermistor cable or sensor has not been repaired. The fault condition must be physically corrected for the error to stay cleared. Resetting without repairing is not a lasting solution.
How much does it cost to repair the evaporator thermistor on a U-Line freezer?
Repair costs vary depending on whether just the thermistor cable or the full sensor assembly needs replacement, and whether a technician is performing the work. Parts alone typically range from around $20 to $80 depending on the specific component needed. With professional labor, the total repair cost generally falls somewhere between $100 and $250, though this can vary by region and service provider.

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