Samsung Air Conditioner Error Code 308

Samsung air conditioner error code 308 indicates a fault in the suction temperature sensor circuit. The suction temperature sensor monitors the refrigerant temperature at the suction line, which is the low-pressure side of the system where refrigerant returns to the compressor as a gas. This data is critical for the control board to regulate compressor operation, prevent liquid slugging, and optimize overall system efficiency. When the control board detects a signal outside the expected resistance range, either too high (open circuit) or too low (short circuit), it triggers error code 308 and may shut down the unit to prevent damage.

The three primary fault conditions are connector dislocation, wire breakage, and a defective sensor. Connector dislocation means the sensor's harness plug has partially or fully pulled away from its mating connector on the control board or intermediate harness. Wire breakage is a physical break in the sensor wiring, which creates an open circuit and causes the board to read an abnormally high resistance value. A defective sensor means the thermistor element inside the sensor has failed, either drifting out of its calibrated resistance range or failing completely in an open or shorted state.

Diagnosis should begin at the wiring harness. Inspect the suction sensor connector for secure seating and signs of corrosion or bent pins. If the connector is intact, use a multimeter to measure the sensor's resistance across its terminals and compare the reading to the temperature-resistance curve specified for the unit. A reading of infinite resistance confirms an open circuit, while near-zero resistance indicates a short. If wiring and connector check out, the sensor itself should be replaced.