Samsung Air Conditioner Error Code RED_FLICKER_GRN_FLICKER

This error code indicates a 4-way valve error in the outdoor unit. The 4-way valve controls the direction of refrigerant flow and is essential for both cooling and heating operation. The system has detected that the valve is not functioning or responding correctly, so it shuts down to prevent damage. Diagnosis starts with inspecting the valve wiring and the solenoid coil before considering valve or board replacement.

No. When this error is active, the system has already stopped normal operation to protect itself. Attempting to force the unit to run with a faulty 4-way valve can stress the compressor and other refrigerant circuit components, potentially causing more extensive and costly damage. The unit should remain off until the valve fault is diagnosed and resolved.

A power reset may temporarily clear the error code, but if the underlying fault with the 4-way valve, its wiring, or the control board has not been repaired, the error will return once the system attempts to operate. Resetting without fixing the root cause is not a solution and can delay necessary repairs. The error should be properly diagnosed before relying on a reset.

Checking the wiring harness at the outdoor unit for loose connections or visible damage is something a confident DIYer can attempt. However, testing solenoid coil resistance, diagnosing the outdoor control board, or replacing the 4-way valve involves working with refrigerant-side components and high-voltage circuitry, which requires a certified HVAC technician. Attempting valve replacement without proper training and tools is not recommended.

Repair costs vary depending on the root cause. If only wiring repairs are needed, costs are typically in the range of $75 to $200 including labor. A solenoid coil or full 4-way valve replacement can run from $200 to $600 or more depending on the model and labor rates in your area. Outdoor control board replacement tends to fall in the $300 to $700 range. A technician diagnosis fee is usually required before an accurate estimate can be given.