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Error code reference

U-Line Ice Maker Error Code Condenser T Open

Evaporator (condenser line out) thermistor circuit open.

U-Line codesU-Line ice maker codes

Evaporator (condenser line out) thermistor circuit open.

First step from the service manual

Check thermistor connection to harness for moisture or corrosion. Also check connection where thermistor harness attaches to main board. If connections are valid replace the thermistor.

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

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What Condenser T Open means on a U-Line ice maker

The "Condenser T Open" error on a U-Line ice maker indicates an open circuit condition in the evaporator thermistor circuit, specifically the sensor positioned on the condenser line outlet. This thermistor monitors refrigerant temperature at a critical point in the refrigeration cycle. When the control board detects that the thermistor circuit is open rather than reading a valid resistance, it triggers this fault code and halts normal operation to prevent damage to the refrigeration system.

An open circuit in the thermistor loop typically means the sensor itself has failed internally, or that the electrical connection between the thermistor and the main control board has been broken. Moisture and corrosion at the connector are among the most common culprits, particularly in ice maker environments where condensation is a constant factor. The wiring harness that runs from the thermistor to the board passes through areas exposed to humidity, making connector pins vulnerable to oxidation over time.

Diagnosis should begin at the physical connections before replacing any components. Inspect the thermistor connector for corrosion, moisture intrusion, or backed-out terminals. Then trace the harness to where it plugs into the main board and inspect that connection as well. If both connection points appear clean, secure, and undamaged, the thermistor itself has likely failed and requires replacement to restore normal operation.

Source: manufacturer service documentation.

Common causes of Condenser T Open

  1. 01

    Corroded or moisture-damaged thermistor connector

    Wiring / connection

    Ice maker environments expose wiring connectors to constant humidity and condensation. Oxidation or corrosion on the thermistor connector pins can break the circuit, triggering an open fault. Look for green or white buildup on the connector pins.

  2. 02

    Failed evaporator thermistor

    Part replacement

    The thermistor itself can fail internally, causing a permanently open circuit regardless of connector condition. If connections are clean and secure, the thermistor is the most likely component to replace.

  3. 03

    Loose or disconnected harness at the main board

    Wiring / connection

    The connector where the thermistor harness plugs into the main control board can loosen over time due to vibration. Check that the harness is fully seated and latched at the board connection point.

  4. 04

    Damaged wiring in the thermistor harness

    Part replacement

    A break or nick in the wire insulation along the harness run can cause an open circuit. Inspect the full length of the wiring from the thermistor to the board for visible damage, pinching, or wear.

  5. 05

    Main control board fault

    Part replacement

    If the thermistor and all wiring connections test good, a failure on the control board at the thermistor input circuit could produce an open fault reading. This is the least common cause and should be considered only after other components are ruled out.

See the test procedure for each cause

Frequently asked questions about Condenser T Open

What does Condenser T Open mean on a U-Line ice_maker?
Condenser T Open means the control board has detected an open circuit in the evaporator thermistor circuit located at the condenser line outlet. This sensor monitors refrigerant temperature, and an open circuit means the board is receiving no valid signal from it. The cause is typically a corroded connector, a loose harness connection, or a failed thermistor. The ice maker will not run normally until the fault is corrected.
Can I fix the Condenser T Open error myself?
Yes, in many cases. Start by unplugging the unit and inspecting the thermistor connector and the harness connection at the main board for corrosion, moisture, or loose pins. Cleaning the connector or reseating the harness may resolve the fault without any parts. If connections are good, replacing the thermistor is a straightforward repair that a knowledgeable DIYer can typically handle.
Is the Condenser T Open error dangerous or urgent?
The error is not a safety hazard to people, but it does prevent the ice maker from operating correctly. Running the unit with an unmonitored refrigerant circuit could contribute to component wear over time. It is best to diagnose and correct the fault promptly rather than leaving the unit in a faulted state.
Will resetting the ice maker clear the Condenser T Open error?
A reset may temporarily clear the fault code, but the error will return if the underlying problem is not fixed. Because the fault is triggered by a physical condition, either a bad connection or a failed thermistor, the control board will detect it again once the unit restarts. Address the wiring connections or replace the thermistor before relying on a reset.
How much does it cost to repair a Condenser T Open error on a U-Line ice maker?
If the fix is simply cleaning or reseating a corroded connector, the repair may cost nothing beyond your time. Thermistor replacement parts typically range from around $20 to $60 depending on the specific model. If the main control board is the cause, board replacement costs can range from $150 to $350 or more for parts alone, plus labor if a technician is involved.

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