U-Line Refrigerator Error Code R Evap T Open

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.

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.

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.

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.

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.