Samsung Air Conditioner Error Code 702

Error code 702 indicates a fault with the first closed-loop indoor electrically operated valve. This valve regulates refrigerant flow through the indoor unit, and the control board has detected a problem with its circuit or physical condition. The fault can be caused by wiring connection issues, a broken or shorted coil, rust, or poor sealing around the valve assembly.

It is not recommended to continue operating the unit while error 702 is active. The electrically operated valve controls refrigerant flow, and running the system with a faulty valve can lead to improper refrigerant distribution, reduced cooling performance, and potential damage to the compressor or other components. The system should be inspected and repaired before resuming normal use.

Resetting the outdoor unit (K3) is a recommended diagnostic step and may temporarily clear the error if the fault was caused by a transient electrical issue or a momentary connection problem. However, if the underlying cause is a damaged coil, broken wiring, or a faulty valve, the error will return after the reset once the system attempts to operate the valve again. A reset should be followed by a thorough inspection to confirm the fault has been resolved.

Some basic checks are accessible to a knowledgeable DIYer, such as inspecting the valve wiring harness connector at the PCB for looseness or visible corrosion and resetting the outdoor unit to see if the fault clears. However, testing coil resistance, assessing internal breakage or short circuits, and replacing the valve or coil requires familiarity with refrigerant systems and electrical diagnosis. Most repairs beyond the initial inspection should be performed by a qualified HVAC technician.

Repair costs vary depending on the root cause. If only a wiring connector needs to be reseated or cleaned, the cost is primarily labor, which typically ranges from around $75 to $150 for a service call. If the electrically operated valve coil or the full valve assembly requires replacement, parts and labor combined can range from $150 to $400 or more depending on the specific unit model and local labor rates.