Samsung Air Conditioner Error Code E702

The E702 error code on a Samsung air conditioner indicates that the indoor unit's Electronic Expansion Valve (EEV) has been detected in a closed or stuck-closed condition during the first detection cycle. The EEV is a precision refrigerant metering device controlled by the indoor PCB. It regulates refrigerant flow into the evaporator coil by adjusting its opening position based on system demand. When the PCB commands the valve to open but receives feedback or detects operating conditions consistent with a fully closed valve, it triggers E702 to flag the anomaly before allowing further operation that could damage the compressor or refrigerant circuit.

The most common entry point for diagnosing this fault is the wiring harness connecting the EEV to the PCB. A loose, corroded, or broken connector can prevent the PCB from sending the correct drive signal to the valve's stepper motor coils, leaving the valve in its default closed position. Beyond wiring issues, the EEV itself may have a failed stepper motor, a stuck valve needle, or internal contamination from debris or moisture in the refrigerant circuit.

Because this is flagged as the first detection, the system has logged the condition once but may not yet have locked out operation permanently. Ignoring the fault and allowing repeated detections can escalate the error code and lead to compressor damage from refrigerant flow restrictions. Prompt inspection of the EEV wiring, connector integrity, and valve function is essential to prevent further system damage.