Samsung Air Conditioner Error Code E378

E378 indicates an overcurrent fault detected on the Fan2 motor circuit. The unit's control board has sensed that the secondary fan motor is drawing more current than its safe operating limit allows. The system shuts down automatically to protect the motor and electrical components from damage.

No, you should not continue operating the unit while E378 is active. The error exists specifically to protect the fan motor and control board from damage caused by excessive current. Running the unit repeatedly through this fault condition can cause permanent damage to the motor or wiring.

Repair costs depend on the failed component. A replacement run capacitor is generally inexpensive, typically in the range of $20 to $80 for the part. A replacement fan motor can range from $80 to $250 or more depending on the model. Labor charges for a qualified technician typically add $75 to $200, and a full control board replacement can push total costs considerably higher.

Some basic checks, such as clearing visible debris from the fan blades or inspecting for ice buildup, can be done safely by a homeowner with the unit powered off. However, testing motor windings, capacitors, and wiring harnesses requires a multimeter and electrical knowledge, so most repairs beyond basic visual inspection should be handled by a qualified technician.

A power reset may temporarily clear the fault display, but if the underlying cause of the overcurrent condition is still present, the error will return once the unit attempts to operate Fan2 again. A reset alone does not fix the problem and should only be done as part of a diagnostic process, not as a long-term solution.