LG Air Conditioner Error Code E320

E320 indicates a compressor OLP (Over Load Protector) sensor error caused by a short circuit or open circuit in the sensor circuit. The control board detects this fault when the sensor voltage rises above 4.95V or drops below 0.5V, corresponding to out-of-range temperature readings of -30°C or 151°C respectively. The error can also be triggered when the outdoor ambient temperature drops below -20°C. The system shuts down to protect the compressor until the sensor issue is resolved.

No, you should not continue operating the unit while E320 is active. The OLP sensor is a critical compressor protection component, and running the system without a functioning sensor removes an important safeguard against compressor overload or overheating. Continued operation could result in compressor damage, which is a significantly more costly repair than replacing the sensor.

Repair costs depend on whether the issue is a failed sensor, damaged wiring, or a corroded connector. An OLP sensor replacement, including parts and labor, typically falls in the range of $100 to $300 depending on the specific unit model and local labor rates. If the wiring harness needs repair or replacement, costs can increase. Diagnosing the root cause before ordering parts will help avoid unnecessary expenses.

Basic checks like inspecting the sensor wiring harness for visible damage or a loose connector can be done by a confident DIYer with the outdoor unit powered off. However, replacing the OLP sensor itself involves working inside the outdoor unit near high-voltage components and refrigerant lines, which is best handled by a qualified technician. The recommended first step is to turn off the system and replace the related sensor, so professional service is the safest approach for most homeowners.

A power reset may temporarily clear the error display, but the fault will return if the underlying sensor or wiring problem has not been fixed. Because E320 is triggered by a measurable voltage condition outside the normal range, the control board will detect the fault again as soon as it reads the sensor on the next startup cycle. A reset alone is not a repair and should not be relied upon to restore normal operation.