LG Air Conditioner Error Code E413

E413 is a sump sensor error code that activates when the compressor sump temperature has been held at or above a specified threshold for five consecutive minutes. The control board triggers this fault as a protective measure to prevent compressor damage. It can indicate a wiring or sensor mounting issue, a failed sensor, or an actual overheating condition in the compressor area.

No, you should not continue operating the unit while E413 is active. The error indicates that the control system has already initiated protection mode to prevent compressor damage. Attempting to bypass or repeatedly restart the unit without resolving the underlying cause risks permanent compressor failure, which is a costly repair.

Repair costs vary depending on the cause. If the fix is simply reseating a connector or repositioning the sensor in its holder, costs may be limited to a diagnostic service call, typically in the range of $75 to $150. A replacement sump sensor generally adds $30 to $100 in parts. If the issue involves the refrigerant system or a failed compressor, costs can range from a few hundred dollars to over $1,000 depending on the extent of the damage.

Some basic checks are accessible to a knowledgeable DIYer, such as inspecting the sensor connector at the PCB and confirming the sensor is properly seated in its holder below the compressor. However, if the sensor needs resistance testing, replacement, or if the issue involves the refrigerant system, a qualified HVAC technician should handle the repair. Working on the refrigerant circuit requires certified technicians and proper equipment.

A reset may temporarily clear the code, but if the underlying cause is not addressed, the error will return once the unit runs long enough to trigger the five-minute threshold again. Resetting without diagnosis and repair only delays the problem and risks compressor damage. The root cause must be identified and corrected for the unit to operate normally.