Samsung Air Conditioner Error Code OUTDOOR_YELLOW_GREEN_RED_ON

This error code indicates a 4-way valve error in the outdoor unit. The 4-way valve controls which direction refrigerant flows through the system, allowing the unit to switch between heating and cooling modes. Samsung's outdoor unit LED indicators display a simultaneous yellow, green, and red pattern to signal this specific fault. The error means the control board has detected that the valve is not operating as expected.

Operating the unit while this error is active is not recommended. A malfunctioning 4-way valve can cause the system to run in the wrong mode or place abnormal stress on the compressor and refrigerant circuit. Continued operation under these conditions risks additional component damage. The unit should be inspected and the fault resolved before resuming normal use.

Repair costs vary depending on what component has failed. If only a wiring repair or connector replacement is needed, costs are typically lower, often in the range of $75 to $200 for a service call and labor. If the 4-way valve itself must be replaced, parts and labor combined can range from $300 to $700 or more, depending on the unit model and local labor rates. Refrigerant recovery and recharge add to the cost when valve replacement is required.

Some steps, such as inspecting wiring connections and checking for loose or corroded terminals at the valve solenoid, can be performed by a knowledgeable DIYer with basic electrical tools. However, if the valve coil or the valve body itself needs replacement, refrigerant recovery and line unsoldering are required, which must be performed by an EPA-certified technician. Starting with wiring inspection is a safe and appropriate first step before committing to parts replacement.

A power reset may temporarily clear the error display, but if the underlying fault with the 4-way valve or its wiring is still present, the error will return once the system attempts to operate the valve again. Resetting without diagnosing and repairing the root cause is not a lasting fix. The valve wiring and coil must be inspected and repaired or replaced as needed.