Samsung Air Conditioner Error Code E319

Error code E319 on a Samsung air conditioner indicates a fault detected in the suction temperature sensor circuit. The suction temperature sensor monitors the refrigerant temperature at the point where low-pressure refrigerant gas returns to the compressor inlet. This data is critical for the control board to regulate refrigerant flow, protect the compressor from liquid slugging, and optimize overall system efficiency. When the PCB detects a reading outside the expected resistance range, indicating either an open circuit or a short circuit, it triggers E319 and halts normal operation to prevent compressor damage.

An open circuit condition means the sensor circuit has a break, resulting in infinite or unmeasurably high resistance at the PCB terminals. A short circuit condition means the sensor leads or wiring have contacted each other or a ground path, pulling resistance down to near zero. Both conditions produce readings that fall outside the valid operating range of the sensor, which the control board interprets as a sensor error rather than a real temperature measurement. The first diagnostic step is to inspect whether the sensor connector has become physically separated from the PCB header, since a loose or disconnected connector mimics an open circuit and is a common root cause.

If the connector is seated properly, the next step is to measure the sensor's resistance directly across the sensor leads with a multimeter. A functioning suction temperature sensor should produce a resistance value consistent with the current ambient or refrigerant temperature, following a negative temperature coefficient (NTC) characteristic. Readings of zero ohms or infinite ohms confirm a shorted or open sensor respectively, pointing to sensor replacement. Damaged wiring harnesses, corrosion at connector pins, and physical sensor element failure are the most frequent causes of this fault.