Samsung Air Conditioner Error Code E374

E374 indicates a heat sink temperature sensor error on the inverter PBA2, which is one of the main power control boards in the unit. The system has detected that the sensor monitoring the board's heat sink is producing an abnormal signal, either due to a sensor failure, wiring fault, or an actual overheating condition. The unit shuts down to prevent damage to the inverter components. A technician will need to inspect the sensor, wiring, and board to isolate the fault.

No. The E374 error typically causes the unit to shut itself down precisely because continued operation without reliable heat sink temperature monitoring risks overheating and permanent damage to the inverter power board. Do not attempt to force the unit to run while this error is active. Have the fault diagnosed and repaired before resuming normal operation.

Repair costs vary depending on what component has failed. If only a sensor or wiring repair is needed, costs are generally in the range of $100 to $250 including labor. If the inverter PBA2 requires replacement, the total cost including parts and labor can range from $300 to $700 or more depending on the model and part availability. Getting a diagnostic assessment from a certified technician before committing to a repair is advisable.

Basic checks such as inspecting the wiring harness and connector for visible damage or looseness can be done by a knowledgeable DIYer. However, diagnosing and replacing the heat sink temperature sensor or the inverter PBA2 requires working near high-voltage components inside the unit and should be performed by a qualified technician. Improper handling of inverter board components carries a serious risk of electric shock.

A power reset may temporarily clear the error code and allow the unit to restart, but if the underlying fault in the sensor, wiring, or board remains, the error will return quickly. A reset is not a repair. It can be useful to confirm whether the fault is intermittent, but a proper diagnosis of the sensor and inverter PBA2 is still required.