Samsung Air Conditioner Error Code E393

E393 indicates an output current sensor error on the Fan2 circuit. The Fan PCB, which monitors current delivered to the secondary fan motor, has detected a reading outside the acceptable range. The system shuts down to protect the unit from potential damage caused by an electrical fault in the fan circuit.

No, you should not continue operating the unit while E393 is active. The error indicates a current sensing fault in the fan circuit, and running the system without proper current monitoring could allow an electrical fault to go undetected. This creates a risk of further component damage or, in a worst-case scenario, an electrical hazard.

A power reset may temporarily clear the E393 error code, but if the underlying fault in the Fan PCB or fan circuit remains, the error will return once the unit attempts to operate the Fan2 motor. A reset alone is not a repair. The Fan PCB and associated wiring should be inspected and replaced as needed to permanently resolve the fault.

Diagnosing and resolving E393 requires working with live electrical components inside the air conditioner, which carries a significant safety risk without proper training. A knowledgeable technician should inspect the Fan PCB, wiring harness, and Fan2 motor connections. Replacing the Fan PCB, which is the primary corrective action, requires disassembly of the unit and careful handling of electrical components.

Repair costs will vary depending on the specific model and local labor rates. If only the Fan PCB needs replacement, parts and labor combined typically fall in the range of $150 to $400. If the Fan2 motor is also found to be faulty, costs can rise higher depending on the motor price for your specific unit.