LG Air Conditioner Error Code E516

E516 on an LG air conditioner means the control board is not receiving a feedback signal from the fan inside the control box. This fan is responsible for cooling internal electrical components, and the unit shuts down when it cannot confirm that fan is operating. The cause can be a failed motor, damaged wiring, a blocked fan blade, or a faulty control board.

No, you should not continue running the unit while E516 is active. The control box fan cools critical components like the inverter board and power transistors. Operating without adequate cooling in that enclosure can cause those components to overheat and fail permanently, turning a relatively straightforward repair into a much more expensive one.

Repair costs depend on which component has failed. A replacement control box fan motor typically runs in the range of $50 to $150 for the part, with labor adding to the total. If the control board itself needs replacement, costs can range from $200 to $600 or more depending on the model. A technician diagnosis is the best way to get an accurate estimate before committing to a repair.

Some basic checks are possible for experienced DIYers, such as inspecting the fan area for visible obstructions and checking that all connectors are securely attached. However, testing motor winding resistance, verifying feedback signal voltage, and replacing internal components involves working near high-voltage circuits and is best handled by a qualified technician. Attempting repairs without proper knowledge of electrical safety around air conditioning equipment carries real risk.

A power reset may temporarily clear the error code, but if the underlying fault still exists, the code will return once the system attempts to run the fan and again receives no feedback. Resetting without fixing the root cause does not resolve the problem and may delay proper diagnosis.