Samsung Air Conditioner Error Code E570

The E570 error code on a Samsung air conditioner indicates an Inverter DC Link sensor error. The DC link is the high-voltage DC bus that sits between the rectifier stage and the inverter stage of the variable frequency drive (VFD) inside the outdoor unit. This bus typically operates at several hundred volts DC and powers the inverter switching circuitry that drives the compressor motor at variable speeds. A sensor monitors the voltage level on this DC link, and when readings fall outside acceptable parameters or the sensor circuit itself fails, the E570 code is triggered.

The error can originate from a few distinct failure points. The DC link voltage sensor or its associated signal conditioning circuit may have failed, producing readings that are out of range or completely absent. Alternatively, the actual DC link voltage may be abnormal due to problems with the rectifier stage, filter capacitors, or power input quality. A failed or degraded electrolytic capacitor on the DC link bus is a common hardware culprit, as these components degrade over time and can cause voltage ripple or collapse that the sensor detects as an error condition.

Because this fault involves the high-voltage inverter board inside the outdoor unit, it requires careful handling. Technicians should always allow adequate discharge time after powering down the unit before probing the DC link circuit, as the filter capacitors can retain lethal voltages for several minutes. Diagnosis typically involves checking the inverter control board for visible damage, verifying input power quality, and testing the capacitor bank and sensor circuit for proper values.