U-Line Refrigerator Error Code L Evap T Open

This code means the control board is detecting an open circuit in the left evaporator thermistor, the temperature sensor mounted near the left evaporator coil. An open circuit means the electrical signal from the sensor is not reaching the board. The cause is typically a loose connector, a failed thermistor, or damaged wiring in that sensor circuit.

A power reset may temporarily clear the code from the display, but it will return as soon as the control board checks the thermistor circuit again and finds it still open. The underlying fault in the sensor, connector, or wiring must be corrected for the error to clear permanently.

If the fix is simply reseating a loose connector, there is no parts cost involved. Replacing a failed evaporator thermistor typically costs between $20 and $60 for the part, plus labor if a technician is called. If the control board turns out to be at fault, repair costs can range from $150 to $400 or more depending on the board and service rates in your area.

Start by locating the left evaporator thermistor connector and checking that it is fully seated and free of corrosion or damage. If the connection looks good, use a multimeter to test the thermistor's resistance. A reading of infinite resistance confirms the sensor has failed and needs replacement. If both the sensor and wiring test normal, the control board may need to be evaluated.

Operating the unit with this fault is not recommended for extended periods. Without valid temperature data from the left evaporator thermistor, the control board cannot properly manage defrost cycles or cooling on that side of the unit. This can lead to food safety concerns due to inconsistent temperatures or potential issues from uncontrolled frost buildup.