Samsung Air Conditioner Error Code P702

Samsung error code P702 on a split or multi-split air conditioning system indicates an outdoor unit protection control event at a low-level risk classification, combined with an indoor unit electronic expansion valve (EEV) opening error. The EEV is a precision refrigerant metering component that regulates the flow of refrigerant into the indoor heat exchanger. When the EEV fails to open correctly, refrigerant flow becomes restricted or uncontrolled, which disrupts the pressure balance across the system. The outdoor unit protection logic detects this abnormal operating condition and flags a low-level risk alert to prevent further damage to compressor and refrigerant circuit components.

The EEV opening error can stem from several sources. The valve itself may have a failed stepper motor coil, preventing the actuator from responding to control signals. Wiring between the indoor unit control board and the EEV coil connector may be damaged, corroded, or disconnected. The indoor PCB may be failing to output the correct pulse signal to drive the valve. In some cases, debris or moisture contamination inside the refrigerant circuit can mechanically obstruct the valve needle from reaching its commanded position.

Because this code combines a protection event with a specific component fault, both the refrigerant circuit condition and the EEV electrical circuit need to be evaluated. Technicians should inspect the EEV coil resistance, verify the harness connections at the valve and the control board, and check for abnormal system pressures that may indicate a refrigerant issue contributing to the protection trigger. Addressing only one side of the fault without evaluating the other can result in the code returning after restart.