LG Air Conditioner Error Code E2

The E2 code on an LG air conditioner indicates a short circuit or open circuit in the indoor air thermostat (thermistor) circuit. The control board is receiving a resistance reading from the indoor temperature sensor that is either far too low or far too high to be valid. As a result, the unit stops operating normally and displays E2 until the fault is corrected.

Powering the unit off and back on may temporarily clear the E2 display, but the code will return as soon as the control board re-evaluates the thermistor circuit and detects the same fault. A reset does not address the underlying sensor or wiring issue. Persistent reappearance of E2 after a reset confirms that a component repair or replacement is needed.

Repair costs vary depending on the specific cause and local labor rates. If only the thermistor sensor needs replacement, costs are generally in the lower range, typically between $75 and $200 including parts and labor. If the control board needs replacement, costs can range from $200 to $500 or more. A technician can provide a firm estimate after diagnosing which component has failed.

Because this error involves internal wiring, sensors, and potentially the control board, LG recommends calling a qualified technician to diagnose and repair the problem. A technician can safely disassemble the indoor unit, test the thermistor resistance, inspect the wiring harness, and replace any faulty components. Attempting this repair without proper knowledge of the unit's internals can cause additional damage.

No. When the E2 code is active, the unit is not able to accurately read indoor temperature, meaning it cannot regulate its operation correctly. Running the system in this condition could cause it to operate outside normal parameters. It is best to leave the unit off until a technician has inspected and repaired the fault.