Samsung Air Conditioner Error Code 152

Error code 152 on a Samsung air conditioner indicates a second closing error of the indoor electronically operated valve, commonly referred to as the EEV (Electronic Expansion Valve). The EEV is a precision refrigerant metering component that controls the flow of refrigerant into the indoor evaporator coil. It operates via a stepper motor coil that receives pulse signals from the indoor PCB to open and close in precise increments. When the control board attempts to command the valve to its closed position and fails to confirm proper closure on the second attempt, it throws this fault code to protect the refrigeration circuit from improper refrigerant flow.

The most common causes for this error involve issues with the electrical connection between the PCB and the EEV coil, physical degradation of the valve body or coil assembly, or a failure within the coil itself. A loose or corroded wire harness connector at the PCB can interrupt the pulse signal needed to drive the stepper motor. External rust on the valve body can cause the internal mechanism to seize, preventing full travel to the closed position. Internal coil breakage or a short circuit will prevent the solenoid from generating the magnetic field required to move the valve stem.

Diagnosis begins with inspecting the PCB connector for the EEV wire harness, checking for bent pins, corrosion, or looseness. The valve body and surrounding area should be inspected for rust or moisture damage. The coil itself can be tested for continuity and resistance to identify an open circuit or short. After addressing any found issues, resetting the outdoor unit (K3 reset) and retesting the closing sequence confirms whether the repair was successful or if valve replacement is necessary.