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Error code reference

U-Line Ice Maker Error Code R Zone T Short

Right zone thermistor circuit is shorted.

U-Line codesU-Line ice maker codes

Right zone thermistor circuit is 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 R Zone T Short means on a U-Line ice maker

The R Zone T Short error on a U-Line ice maker indicates that the thermistor circuit monitoring the right zone temperature has developed a short circuit condition. Thermistors are resistive temperature sensors whose resistance value changes predictably with temperature. A short circuit in this circuit means the resistance has dropped abnormally low, sending a signal to the control board that falls outside the expected operating range. The board interprets this as a fault condition and triggers the error code to prevent incorrect temperature regulation.

The right zone thermistor is part of the refrigeration monitoring system, providing real-time temperature feedback so the control board can manage compressor and fan operation appropriately. When this sensor circuit shorts, the board loses reliable temperature data for that zone, which can result in the ice maker running incorrectly or shutting down entirely to protect components.

The most common physical causes of a shorted thermistor circuit include damaged wiring, a pinched cable routed through a door hinge or cabinet panel, moisture intrusion at a connector, or a failed thermistor sensor itself. The recommended first diagnostic step is a thorough inspection of the thermistor cable along its entire run, looking for pinch points, cuts, abraded insulation, or connector corrosion. If the cable shows visible damage, replacement is the appropriate next step. If the wiring appears intact, the thermistor sensor itself should be tested for a resistance short to confirm it has failed internally.

Source: manufacturer service documentation.

Common causes of R Zone T Short

  1. 01

    Pinched or damaged thermistor cable

    Part replacement

    The thermistor wiring can become pinched at door hinges, cabinet edges, or panel seams during installation or routine use. A pinch point that cuts through the insulation can create a short between conductors, triggering this error.

  2. 02

    Failed thermistor sensor

    Part replacement

    The thermistor sensor itself can fail internally, causing its resistance to drop to near zero and creating a short circuit condition at the control board. Testing the thermistor with a multimeter for abnormally low resistance will confirm this failure.

  3. 03

    Moisture or corrosion at the wiring connector

    Wiring / connection

    Water intrusion at the thermistor connector can bridge terminals and simulate a short circuit. Inspect the connector for visible corrosion, moisture, or mineral deposits, particularly near the evaporator or any area exposed to condensation.

  4. 04

    Abraded wire insulation causing a short to ground

    Part replacement

    If the thermistor cable runs near a sharp metal edge or vibrating component, the outer insulation can wear through over time. Bare conductor contact with the chassis or another wire creates a short that triggers this error.

  5. 05

    Faulty control board

    Part replacement

    In rare cases, the control board input circuit for the right zone thermistor can fail internally, reading a short even when the thermistor and wiring are both good. This should only be considered after the sensor and cable have been tested and confirmed functional.

See the test procedure for each cause

Frequently asked questions about R Zone T Short

What does R Zone T Short mean on a U-Line ice_maker?
R Zone T Short means the thermistor circuit monitoring the right temperature zone has detected a short circuit condition. The control board is receiving an abnormally low resistance signal from that sensor or its wiring. This prevents accurate temperature monitoring and will typically cause the unit to stop normal operation until the fault is resolved.
Can I fix the R Zone T Short error myself?
A knowledgeable DIYer can start by visually inspecting the thermistor cable for pinch points, cuts, or connector corrosion, which are the most common causes. If the cable looks intact, testing the thermistor with a multimeter to check for abnormally low resistance is the next step. Thermistor and wiring replacement are straightforward repairs, but if the control board is involved, professional service is recommended.
Is it safe to keep using my U-Line ice maker when the R Zone T Short error is active?
Continuing to run the unit with an active thermistor short is not recommended. Without accurate temperature feedback from the right zone, the ice maker cannot regulate that area properly, which could lead to inconsistent ice production, component stress, or further damage. It is best to address the fault before resuming normal use.
How much does it cost to repair a R Zone T Short error on a U-Line ice maker?
Repair costs vary depending on what component has failed. A thermistor sensor or wiring harness replacement is generally a lower-cost repair, typically in the range of $50 to $150 for parts, plus any labor charges. If the control board requires replacement, costs can rise to the $200 to $500 range or higher depending on the model and service rates in your area.
Will resetting my U-Line ice maker clear the R Zone T Short error?
A power reset may temporarily clear the error code, but it will return as soon as the control board reads the thermistor circuit again and detects the short. The underlying cause, whether a damaged cable, a failed sensor, or a corroded connector, must be identified and corrected before the error will clear permanently.

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