Samsung Air Conditioner Error Code E322

The E322 error code on a Samsung air conditioner indicates a fault with the EVI OUT temperature sensor located in the outdoor unit. EVI stands for Enhanced Vapor Injection, a refrigerant circuit component used in heat pump systems to improve efficiency at low ambient temperatures. The EVI OUT sensor monitors the refrigerant temperature at the outlet of the EVI circuit, and this data is used by the outdoor PCB to regulate system operation. When the sensor signal falls outside the expected range or is absent entirely, the controller logs E322 and may restrict or shut down operation to protect the system.

The three root causes identified for this fault are connector dislocation from the PCB, a broken wire in the sensor harness, or a defective sensor element itself. Connector dislocation is the most common starting point because vibration during compressor operation can loosen push-in connectors over time. A broken wire typically results from chafing against sheet metal edges inside the outdoor cabinet or from physical damage during installation or service. A defective sensor usually means the thermistor element has drifted out of specification or failed open or short circuit.

Diagnosis should begin at the outdoor unit by inspecting the EVI OUT sensor connector on the PCB for any sign of partial pullout or corrosion on the terminals. If the connector is seated properly, the technician should check continuity along the sensor wiring harness and then measure the sensor resistance to determine whether it falls within the expected range for the current ambient temperature. A sensor reading open or short circuit at a known temperature confirms sensor replacement is needed.