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Error code reference

U-Line Refrigerator Error Code R Evap T Open

Right evaporator thermistor circuit is open.

U-Line codesU-Line refrigerator codes

Right evaporator thermistor circuit is open.

First step from the service manual

Inspect evaporator thermistor connection. 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 Evap T Open means on a U-Line refrigerator

The R Evap T Open error code on a U-Line refrigerator indicates that the control board is detecting an open circuit in the right evaporator thermistor. A thermistor is a temperature-sensing resistor whose resistance changes predictably with temperature. When the circuit reads as open, the board is receiving no signal from the thermistor, meaning the resistance has gone to infinity rather than within the expected operating range. Without this input, the refrigerator cannot accurately monitor evaporator coil temperature on the right side, which disrupts defrost cycle management and overall cooling control.

The evaporator thermistor is typically clipped or mounted directly to the evaporator coil and connected to the main control board via a wiring harness. An open circuit in this system is most often caused by a disconnected or corroded connector, a broken wire in the harness, or a failed thermistor itself. Physical damage from ice buildup around the evaporator can also stress or sever the thermistor leads or pull connectors apart over time.

Diagnosis should begin at the thermistor connector, checking for secure seating and signs of corrosion or moisture intrusion. If the connector and wiring appear intact, the thermistor itself should be tested with a multimeter. A properly functioning thermistor will show measurable resistance that changes with temperature. A reading of infinite resistance (OL) at room temperature confirms the thermistor has failed internally and requires replacement.

Source: manufacturer service documentation.

Common causes of R Evap T Open

  1. 01

    Loose or disconnected thermistor connector

    Wiring / connection

    The wiring connector between the thermistor and the control board harness may have come loose or pulled apart, especially if ice buildup has stressed the wiring. Inspect the connector at the thermistor and along the harness routing for secure seating.

  2. 02

    Failed evaporator thermistor

    Part replacement

    The thermistor itself may have failed internally, resulting in an open circuit. Testing with a multimeter will show an infinite resistance reading (OL) rather than a finite, temperature-dependent value, confirming the part needs replacement.

  3. 03

    Broken or damaged wiring in the harness

    Part replacement

    A wire in the thermistor circuit may be broken or frayed due to physical stress, ice pressure, or repeated freeze-thaw cycles. Visually inspect the full length of the harness for cuts, kinks, or exposed conductors.

  4. 04

    Corroded or moisture-damaged connector terminals

    Wiring / connection

    Moisture intrusion in the freezer or evaporator compartment can corrode the thermistor connector terminals, increasing resistance to the point of an open circuit. Look for discoloration, oxidation, or white residue at the connector pins.

See the test procedure for each cause

Frequently asked questions about R Evap T Open

What does R Evap T Open mean on a U-Line refrigerator?
R Evap T Open means the control board is detecting an open circuit in the right evaporator thermistor. The thermistor is a temperature sensor mounted on the right evaporator coil, and an open circuit means the board is receiving no signal from it. This prevents proper temperature monitoring and defrost cycle management on the right side of the refrigerator. The most common causes are a disconnected wiring connector or a failed thermistor.
How do I fix the R Evap T Open error on my U-Line refrigerator?
Start by inspecting the thermistor connector at the evaporator to make sure it is fully seated and free of corrosion. If the connector is secure, use a multimeter to test the thermistor for resistance. A reading of infinite resistance (OL) at room temperature means the thermistor has failed and needs to be replaced. If wiring damage is found along the harness, that section will need to be repaired or the harness replaced.
Is it safe to keep using my U-Line refrigerator with the R Evap T Open error?
Operating the refrigerator with this error is not recommended for an extended period. Without accurate evaporator temperature readings, the control board cannot properly manage the defrost cycle or cooling on the right side, which can lead to excessive ice buildup or inadequate cooling. Food safety may be at risk if temperatures drift out of range. Address the error as soon as possible.
Will resetting my U-Line refrigerator clear the R Evap T Open error?
A reset may temporarily clear the error code from the display, but it will return if the underlying problem is not repaired. The control board will re-detect the open circuit in the thermistor on the next monitoring cycle. A reset is only useful for confirming whether the fault is intermittent, such as a loose connector that reconnects temporarily. A permanent fix requires inspecting and correcting the thermistor circuit.
How much does it cost to repair the R Evap T Open error on a U-Line refrigerator?
If the issue is simply a loose connector, the repair may cost nothing beyond your time. If the thermistor needs replacement, parts typically range from $20 to $60 depending on the specific model, plus labor if a technician is used. Professional diagnostic and repair service for this type of fault generally runs between $100 and $250 in total, depending on local labor rates and whether additional wiring repairs are needed.

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