LG Refrigerator Error Code WT-Sensor

The WT-Sensor code indicates that the water tank temperature sensor has failed or is sending a signal outside the acceptable range to the control board. This sensor monitors the temperature of the internal chilled water tank. The fault can be caused by a bad sensor, corroded connector pins, or a damaged wiring harness. A resistance test at connector CON6, pins 9 and 10, is the standard first step to diagnose the problem.

The WT-Sensor error is not a safety hazard in most cases. It indicates a sensor circuit failure rather than a refrigerant or electrical safety issue. The most likely impact is that the chilled water dispenser may not function correctly. Food preservation in the main refrigerator and freezer compartments is generally not affected by this specific fault.

A power reset may temporarily clear the WT-Sensor code, but if the underlying sensor or wiring fault is still present, the error will return. Resetting is not a fix, only a way to confirm whether the fault is intermittent or persistent. A proper diagnosis using the CON6 resistance test is necessary to resolve the error permanently. Continuing to reset the unit without repair may mask an ongoing fault in the water tank circuit.

A knowledgeable DIYer with a multimeter can perform the resistance test at CON6 pins 9 and 10 to determine whether the sensor or wiring is the cause. If the resistance reads outside 6 to 300 kΩ, or shows an open or short circuit, the sensor or harness will need to be replaced. Reseating the connector is also a straightforward first step that requires no special tools. However, if the fault points to the main control board, professional diagnosis is recommended.

Repair costs vary depending on the root cause. Replacing the water tank temperature sensor typically costs between $20 and $80 for the part, plus labor if a technician is hired. A wiring harness repair or connector replacement may fall in a similar range. If the main control board is at fault, parts alone can range from $100 to $300 or more. Getting a diagnosis before ordering parts will help avoid unnecessary expense.