LG Microwave Error Code E02

E02 on an LG microwave indicates a thermistor open-circuit fault detected by the PCB. The control board is not receiving a valid signal from the thermistor, which monitors internal temperatures during operation. This can result from a disconnected connector, a failed thermistor, damaged wiring, or in some cases a heater fault. The microwave will not operate normally until the fault is resolved.

No, you should not continue using the microwave while E02 is active. The thermistor is a safety-critical component that allows the PCB to monitor and control operating temperatures. Running the unit without reliable temperature feedback could result in overheating, damage to internal components, or a fire hazard. Discontinue use until the fault is diagnosed and repaired.

Repair costs vary depending on which component has failed. A replacement thermistor is generally an inexpensive part, typically in the range of $10 to $30, while a PCB assembly can cost considerably more, often between $80 and $200 or higher depending on the model. Adding professional labor charges, a full repair could range from $100 to $300 or more. In some cases, particularly with older or lower-cost models, replacement of the entire unit may be more economical than PCB repair.

Checking and reseating the connector between the thermistor and the PCB is a straightforward first step that a confident DIYer can perform after unplugging the unit. Testing the thermistor with a multimeter for continuity is also within reach for someone comfortable with basic electrical testing. However, working inside a microwave carries serious safety risks due to high-voltage capacitors that retain charge even when unplugged, so caution and proper discharge procedures are essential. If the PCB itself needs replacement, professional repair is recommended.

A power reset by unplugging the microwave for several minutes may temporarily clear the E02 display, but the error will return if the underlying fault is still present. Because E02 reflects an actual circuit or component condition detected by the PCB, clearing the code without repairing the cause does not resolve the problem. A proper repair of the thermistor circuit or related components is required for a lasting fix.