Samsung Air Conditioner Error Code E410

The E410 error code on a Samsung air conditioner indicates an OPEN or SHORT fault detected on the discharge temperature sensor for the fixed capacity compressor 3 (compressor 3 discharge sensor). This sensor monitors the temperature of refrigerant gas exiting the compressor, which is critical for protecting the compressor from overheating and for ensuring efficient system operation. The control board flags this fault only when the outdoor ambient temperature is above -10°C, preventing false triggers from extreme cold conditions that could affect sensor readings.

The fault thresholds are based on voltage output from the sensor circuit. A reading above 4.95V corresponds to a temperature of approximately -30°C and indicates an OPEN circuit condition, meaning the signal is floating high due to a broken wire, disconnected connector, or failed sensor. A reading below 0.5V corresponds to approximately 151°C and indicates a SHORT circuit condition, where the sensor or wiring has shorted to ground or another conductor. Both conditions represent out-of-range signals that the control board cannot interpret as valid temperature data.

Diagnosis begins at the sensor connector. The technician should inspect the connector for corrosion, bent pins, or loose seating, then disconnect the sensor and measure resistance across its two terminals. The resistance value should correspond to a known temperature-resistance curve for that sensor type. A reading of infinite resistance confirms an open circuit, while a reading near zero ohms confirms a short. If connector and wiring check out, the sensor itself is likely the failed component.