Samsung Air Conditioner Error Code E387

E387 indicates a Hall IC connection error for Fan2, the second fan motor in the system. The Hall IC is a sensor that reports the fan motor's rotational speed and position to the control board. When the board does not receive a valid signal from this sensor, it triggers the E387 fault and shuts the system down to prevent damage. The root cause is typically a wiring fault, a failed sensor, or a failed motor.

No, you should not continue operating the unit while E387 is active. The system has detected that Fan2 is not functioning correctly, which means airflow and heat exchange are compromised. Running the unit in this state could cause overheating of internal components and lead to additional damage beyond the original fault.

A power reset may temporarily clear the E387 code from the display, but the error will return if the underlying problem has not been resolved. Because this fault is tied to a hardware issue with the Fan2 motor circuit, resetting the unit does not fix the sensor, wiring, or motor problem causing the fault. A proper diagnosis and repair of the root cause is required to permanently resolve the error.

Some basic diagnostics are within reach for a knowledgeable DIYer, such as inspecting and reseating the wiring connectors on the Fan2 motor. However, testing the Hall IC output signal requires a multimeter or oscilloscope and comfort working around energized components. Replacing the fan motor or control board should be performed by a qualified technician to ensure safe and proper installation.

Repair costs vary depending on the root cause. If the fix is simply reseating a loose connector, there may be little to no parts cost, though a service call fee typically applies. A replacement fan motor can range from roughly $80 to $250 or more for the part alone, with labor adding to the total. A control board replacement, if needed, generally costs more. Getting a diagnostic visit from a certified technician will clarify the exact repair needed.