LG Dryer Error Code LE4

LE4 indicates that the low temperature thermistor at the evaporator inlet has been detected as open or shorted. This sensor monitors incoming air temperature in the heat pump system. The dryer stops operation when this fault is triggered to prevent running without accurate temperature data. Diagnosis begins with checking whether the sensor's connector is properly seated and connected.

No, you should not attempt to run the dryer while the LE4 fault is active. The dryer halts operation intentionally because it cannot accurately monitor evaporator inlet temperature without a functioning thermistor. Running the heat pump system without this sensor input could lead to improper operation or component damage.

A power reset by unplugging the dryer for a few minutes may temporarily clear the code, but if the underlying fault with the thermistor or its wiring persists, the LE4 error will return when the dryer runs again. A reset alone is not a fix and should only be used as part of the diagnostic process after inspecting the connector and sensor.

Checking and reseating the thermistor connector is a straightforward task that a knowledgeable DIYer can attempt after unplugging the dryer. If the connector appears secure, testing the thermistor's resistance with a multimeter is the next step. Replacing the thermistor is also manageable for those comfortable with appliance repair, but tracing wiring harness damage or replacing the control board is better left to a technician.

If only the evaporator inlet thermistor needs replacement, parts typically range from around $15 to $50 depending on the specific model. Adding professional labor, the total repair cost generally falls between $100 and $250. If the control board is at fault, costs can be significantly higher, ranging from $200 to $400 or more with labor included.