LG Heat Pump Error Code E406

E406 indicates an outdoor unit overload protection control error, specifically related to overload circuit 3. The heat pump's control system has detected an abnormal condition in the outdoor unit's overload protection circuit and has shut the system down to prevent component damage. This error can result from a failed overload protector, compressor problems, airflow restrictions, or refrigerant system issues.

No, you should not attempt to bypass or ignore the E406 error. The overload protection circuit exists specifically to prevent serious damage to the compressor and other outdoor unit components. Continuing to operate the system with an active overload fault can lead to compressor failure, which is a significantly more expensive repair.

Repair costs vary widely depending on the cause. Replacing a faulty overload protector is relatively inexpensive, typically in the range of $100 to $300 including labor. If the compressor has failed, repair or replacement costs can range from $800 to $2,500 or more depending on the unit size and refrigerant type. A diagnostic service call is the first step to determine the exact cause and get an accurate estimate.

Some basic checks, such as clearing debris from the outdoor unit and verifying the outdoor fan is spinning freely, can be performed by a homeowner. However, diagnosing a failed overload protector, compressor amperage draw, or refrigerant pressure issues requires specialized tools and training. Most repairs associated with E406 should be handled by a qualified HVAC technician.

A power reset may temporarily clear the E406 code, but if the underlying cause such as a faulty overload protector, compressor fault, or refrigerant issue has not been corrected, the error will return. Repeated resets without addressing the root cause can accelerate component wear and lead to more serious damage.