LG Air Conditioner Error Code 107

Error code 107 on an LG air conditioner indicates a low voltage condition in the main outdoor fan motor driver, caused by a DC voltage charging failure in the inverter fan motor drive circuit. The outdoor unit detects that the DC link voltage is not reaching the required level during startup. The system shuts down to protect the fan motor and drive electronics from damage. A technician should inspect the DC link cable connection and the inverter fan PCB.

No, you should not continue operating the unit while error code 107 is active. The outdoor fan is not running correctly, which means the refrigerant circuit and compressor are not being properly cooled. Continued operation under this condition can cause compressor overheating and potentially lead to more extensive and costly damage. Power down the outdoor unit until the fault is diagnosed and repaired.

Repair costs depend on the root cause. If the issue is simply a loose or corroded DC link cable connection, the cost may be limited to a diagnostic service call fee, typically in the range of $75 to $150. If the inverter fan PCB requires replacement, parts and labor combined can range from $300 to $700 or more depending on the specific unit model and local labor rates. Getting a diagnosis before authorizing repairs is the best way to understand the actual cost.

The first diagnostic step is checking the DC link cable connection inside the outdoor unit, which involves working near high-voltage components. This work is not recommended for homeowners without electrical training, as the DC link capacitors can hold dangerous voltage even after power is disconnected. A qualified HVAC technician should perform the inspection and any required repairs. If the cable connection is normal, the inverter fan PCB will need to be replaced.

A power reset may temporarily clear the error display, but if the underlying cause is not repaired, the fault will return when the unit attempts to start the outdoor fan again. A loose DC link cable may occasionally make intermittent contact, causing the code to appear and disappear, but this does not indicate a resolved problem. Persistent recurrence of error 107 after resets confirms that a physical inspection is needed.