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Error code reference

U-Line Ice Maker Error Code E5

Thermistor 1 shorted

U-Line codesU-Line ice maker codes

Thermistor 1 shorted - Refrigerator Zone thermistor is shorted.

First step from the service manual

Check thermistor connections and OHM test the thermistor.

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

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What E5 means on a U-Line ice maker

The E5 error code on a U-Line ice maker indicates that Thermistor 1, which monitors the refrigerator zone temperature, has developed a short circuit condition. A thermistor is a temperature-sensitive resistor that changes its resistance value as temperature changes. When the control board detects a resistance reading that falls outside the expected range due to a short, it flags the E5 fault and halts normal operation to prevent potential damage to the refrigeration system.

A shorted thermistor typically produces a resistance reading that is far lower than the calibrated range for the sensor at any given temperature. This abnormal reading causes the control board to receive inaccurate or nonsensical temperature data from the refrigerator zone, making reliable temperature regulation impossible. The short can occur within the thermistor component itself, along the wiring harness connecting the sensor to the board, or at the connector terminals.

Diagnosing this fault begins with a visual inspection of the thermistor wiring and connectors for signs of damage, pinching, or corrosion. After visual inspection, an OHM test of the thermistor is performed to confirm whether the sensor is electrically shorted or if the fault originates in the wiring. Comparing the measured resistance against the expected resistance values for the thermistor at the current ambient temperature will confirm whether the sensor or the wiring circuit is the root cause.

Source: manufacturer service documentation.

Common causes of E5

  1. 01

    Failed thermistor (internal short)

    Part replacement

    The thermistor itself has internally shorted, producing an out-of-range resistance reading. An OHM test will confirm this if the resistance reads near zero or far below the expected calibrated value for the current temperature.

  2. 02

    Damaged or pinched wiring harness

    Wiring / connection

    The wiring between the thermistor and the control board may be pinched, kinked, or chafed, causing two conductors to contact each other and create a short. Carefully inspect the full length of the wiring harness for any visible damage.

  3. 03

    Corroded or contaminated connector terminals

    Wiring / connection

    Moisture or ice buildup inside the connector can bridge the terminals and create a short circuit. Inspect the thermistor connector for corrosion, moisture, or debris and clean or replace as needed.

  4. 04

    Thermistor probe displaced from mounting location

    Wiring / connection

    If the thermistor probe has shifted from its designed mounting position, it may be making unintended contact with a grounded metal surface, causing an apparent short. Verify the probe is correctly seated in its clip or bracket.

  5. 05

    Faulty control board

    Part replacement

    If the thermistor and all wiring test within normal resistance specifications, the control board itself may have a shorted input circuit causing it to misread the sensor signal. This is the least common cause and should only be considered after all other components are ruled out.

See the test procedure for each cause

Frequently asked questions about E5

What does E5 mean on a U-Line ice_maker?
The E5 code on a U-Line ice maker means that Thermistor 1, the temperature sensor for the refrigerator zone, has been detected as shorted by the control board. A shorted thermistor produces an abnormal resistance reading that prevents accurate temperature monitoring. The unit will not operate reliably until the fault is diagnosed and corrected.
Can I fix the E5 error code myself?
A knowledgeable DIYer can perform the initial diagnostics, including inspecting the wiring harness, checking connector terminals for corrosion or moisture, and performing an OHM test on the thermistor. If the thermistor tests shorted, replacing the sensor is a straightforward repair for someone comfortable working with appliance wiring. If the wiring and thermistor both test normal, the control board may need professional evaluation.
Is it safe to keep using my U-Line ice maker when the E5 code is displayed?
Continuing to run the unit with an active E5 fault is not recommended. Without accurate refrigerator zone temperature data, the control board cannot regulate cooling properly, which could result in inadequate food or ice preservation and potential stress on the compressor and refrigerant system. The unit should be serviced before returning it to regular use.
Will resetting the U-Line ice maker clear the E5 error?
A simple power reset will not permanently clear the E5 code if the underlying fault is still present. The control board will re-detect the shorted thermistor and display the error again once it runs through its diagnostics. The fault will only clear after the defective component, whether the thermistor itself or the associated wiring, is repaired or replaced.
How much does it cost to repair a U-Line ice maker with an E5 error?
Repair costs depend on the root cause. A replacement thermistor is typically an inexpensive part, with the sensor itself often ranging from $15 to $50 depending on the specific model. If the control board is at fault, that cost increases significantly, generally ranging from $150 to $400 or more for parts alone. Adding professional labor will increase the total cost of the repair.

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