Samsung Air Conditioner Error Code 702

Error code 702 on a Samsung air conditioner indicates a fault with the first closed-loop indoor electrically operated valve (also referred to as an electronic expansion valve or EEV). This component is responsible for regulating refrigerant flow into the indoor unit by opening and closing in precise increments based on signals from the PCB. When the control board detects that the valve is not responding correctly or that its coil circuit is outside expected parameters, it logs error 702 and may suspend normal operation to prevent further system damage.

The most common sources of this fault fall into two categories: wiring and connection issues, and physical valve coil failure. On the wiring side, a loose or corroded connector at the PCB where the electrically operated valve harness terminates is a frequent culprit. The connector should be seated firmly and show no signs of oxidation or pin damage. On the coil side, the valve coil can develop internal breakage, resulting in an open circuit, or it can short internally, both of which the PCB will detect as a fault condition. External rust on the valve body can also indicate moisture intrusion that may have compromised the coil windings.

Diagnosis should begin by inspecting the PCB connection of the valve wiring harness, checking sealing integrity around the valve assembly, and visually examining the coil for rust or physical damage. After addressing any findings, the outdoor unit (K3) should be reset and the system re-evaluated. If the fault persists after confirming good connections and a sound coil, replacement of the electrically operated valve coil or the valve assembly itself is likely required.