LG Air Conditioner Error Code E487

E487 indicates a Hall IC error on the outdoor Fan1 motor, specifically that no signal is being received from the Hall IC sensor. The Hall IC monitors the fan motor's rotation by detecting magnetic field changes and sends a pulse signal back to the fan PCB. When that signal is absent, the unit faults to protect the system. The issue can involve the sensor wiring, the PCB connection, or the fan PCB itself.

No, you should not continue operating the air conditioner while E487 is active. The error means the outdoor fan motor is not confirmed to be running, and operating the compressor without proper fan airflow can cause overheating and serious damage to the refrigeration system. Leave the unit off until the fault is diagnosed and repaired.

Repair costs vary depending on what component has failed. If the fix is simply reseating a loose connector, you may only pay a diagnostic service call fee, typically in the range of $75 to $150. If the fan PCB needs replacement, parts and labor combined can run from $200 to $450 or more depending on the model. A failed fan motor assembly requiring full replacement will generally cost more, ranging from $300 to $600 or higher.

A knowledgeable DIYer can inspect the Hall IC wiring harness and reseat the connector on the fan PCB, which requires accessing the outdoor unit's electrical compartment. However, if the fan PCB or motor assembly needs replacement, that work involves handling high-voltage components and refrigerant-system-adjacent parts, so professional service is strongly recommended. Always disconnect power to the unit before inspecting any wiring.

A power reset may temporarily clear the error code, but if the underlying cause is a failed Hall IC, broken wiring, or a faulty fan PCB, the fault will return as soon as the unit tries to run the outdoor fan again. Resetting without repairing the root cause can delay proper diagnosis and risk further damage to the system.