LG Refrigerator Error Code 02

Error code 02 on an LG refrigerator indicates a fault in the refrigerator compartment temperature sensor circuit. The cause can be a disconnected or loose connector at main PCB CN40 pins 8 and 9, damaged wiring, a short circuit in the harness, or a failed thermistor. The board expects to see between 1.0V and 4.5V at those pins, and anything outside that range triggers the error.

A power reset may temporarily clear the error display, but it will return if the underlying fault in the sensor circuit has not been corrected. Resetting is useful for confirming whether the fault is intermittent, but it is not a repair. The voltage at CN40 pins 8 and 9 should be measured and the circuit fully diagnosed to resolve the code permanently.

Repair cost depends on the failed component. A replacement refrigerator compartment thermistor typically costs in the range of $15 to $50 for the part. If the main PCB requires replacement, parts alone can range from $100 to $300 or more depending on the model. Adding professional labor, a service call generally runs between $100 and $250 in total, though this varies by region and the extent of diagnosis required.

Some causes of error 02 are DIY-friendly. Reseating the connector at CN40, inspecting the wiring harness for visible damage, and cleaning corroded connector pins are tasks a confident DIYer can handle. Replacing the thermistor is also relatively straightforward. However, if the main PCB is the root cause, board replacement or repair is generally a job for an experienced technician.

Error code 02 means the refrigerator cannot reliably measure its internal temperature, which may cause the cooling system to run incorrectly. Food safety could be at risk if the compartment is warmer than the display suggests. It is best to address the fault promptly and use a standalone thermometer to monitor compartment temperature in the meantime.