LG refrigerator sensors and thermistors can be purchased at appliance parts websites, such as RepairClinic.com. Replacement sensors and thermistors can also be purchased at major online retailers, such as Amazon, as of 2015.
Replacement thermistors are normally listed by the manufacturer part number on websites. The part number must match exactly to ensure it is compatible with the original part, although thermistors typically fit a wide range of refrigerators. The thermistor typically displays an error code when the unit is not functioning correctly. The most common reason for a malfunctioning thermistor is a cut or short in the circuit wire, which requires a new thermistor to work correctly.