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Error code reference

Samsung Air Conditioner Error Code RED_FLICKER_GRN_FLICKER

4-Way valve error

Samsung codesSamsung air conditioner codes

4-Way valve error

First step from the service manual

Check 4-way valve wiring to outdoor control board; replace valve if wiring is normal

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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  • Wiring diagram references and connector pinouts from the OEM service manual
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What RED_FLICKER_GRN_FLICKER means on a Samsung air conditioner

The RED_FLICKER_GRN_FLICKER error code on a Samsung air conditioner signals a 4-way valve error. The 4-way valve, also called a reversing valve, is a critical component in the outdoor unit that controls the direction of refrigerant flow. In cooling mode, it directs refrigerant through the system in one path; in heating mode (on heat pump models), it reverses that flow to extract heat from outdoor air and deliver it indoors. When the control board detects that the valve has failed to shift position correctly, or that the electrical signal driving it is abnormal, this error is triggered and the system halts operation.

The most common starting point for diagnosis is the wiring harness connecting the 4-way valve solenoid coil to the outdoor control board. Damaged insulation, loose connector pins, or corrosion at the terminals can all prevent the solenoid from receiving the correct voltage signal needed to actuate the valve. If the wiring checks out visually and with a continuity test, the next step is testing the solenoid coil itself for proper resistance. A coil that has shorted or gone open will not generate the magnetic field required to shift the valve spool.

If wiring and coil resistance are both within spec, the valve body itself may be mechanically stuck or internally damaged, requiring full component replacement. In some cases, the outdoor control board may be failing to output the correct switching voltage to the valve circuit, making board-level diagnosis necessary after the valve and wiring have been ruled out.

Source: manufacturer service documentation.

Common causes of RED_FLICKER_GRN_FLICKER

  1. 01

    Faulty or loose wiring to the 4-way valve

    Wiring / connection

    Wiring between the 4-way valve solenoid and the outdoor control board can develop loose connections, corroded terminals, or insulation damage. Inspect the full harness and connector pins for continuity and secure seating.

  2. 02

    Failed 4-way valve solenoid coil

    Part replacement

    The solenoid coil that actuates the valve spool can burn out or develop an open or short circuit, preventing the valve from switching modes. Testing coil resistance will confirm whether the coil has failed.

  3. 03

    Mechanically stuck 4-way valve

    Part replacement

    The valve spool can become stuck due to debris, corrosion, or wear, leaving it fixed in one position even when the solenoid receives correct voltage. This typically requires full valve replacement.

  4. 04

    Faulty outdoor control board

    Part replacement

    If the board is not outputting the correct switching voltage to the valve solenoid circuit, the valve will not actuate even if it and its wiring are in good condition. Board-level diagnosis should follow after the valve and wiring have been ruled out.

See the test procedure for each cause

Frequently asked questions about RED_FLICKER_GRN_FLICKER

What does RED_FLICKER_GRN_FLICKER mean on a Samsung air_conditioner?
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.
Can I fix a RED_FLICKER_GRN_FLICKER error myself?
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.
Is it safe to keep running my Samsung air conditioner with a RED_FLICKER_GRN_FLICKER error?
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.
How much does it cost to repair a RED_FLICKER_GRN_FLICKER error on a Samsung air conditioner?
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.
Will resetting my Samsung air conditioner clear the RED_FLICKER_GRN_FLICKER error?
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.

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