U-Line Refrigerator Error Code R Zone T Open

This error code means the control board has detected an open circuit in the right zone thermistor circuit. The thermistor is the temperature sensor for the right zone, and an open circuit means the board is receiving no valid resistance signal from it. This prevents accurate temperature monitoring and control in that zone. The issue is usually a loose connector or a failed thermistor.

Operating the refrigerator with an active R Zone T Open error is not recommended for food safety. Without a functioning thermistor, the control board cannot accurately monitor or regulate the temperature in the right zone. Food stored in the affected zone may not be kept at a safe temperature, increasing spoilage risk.

A reset may temporarily clear the error code from the display, but it will return if the underlying problem with the thermistor circuit has not been resolved. The control board will detect the open circuit again as soon as it checks the sensor. A lasting fix requires correcting the wiring connection or replacing the faulty thermistor.

A knowledgeable DIYer can attempt this repair by first inspecting the thermistor connector for any disconnection or corrosion and reseating it firmly. If the connector is secure, testing the thermistor with a multimeter will confirm whether the component itself has failed. Replacing a thermistor is a relatively straightforward repair, though accessing the component in a built-in unit may require partial disassembly.

If only the connector needs reseating, there may be no parts cost at all, though a service call can run anywhere from $75 to $150 or more depending on your area. If the thermistor itself has failed, the replacement part typically costs in the range of $20 to $60, with labor adding to the total if a technician performs the repair.