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Error code reference

Samsung Air Conditioner Error Code OUTDOOR_YELLOW_FLICKER_GREEN_FLICKER

Compressor rotation error

Samsung codesSamsung air conditioner codes

Compressor rotation error

First step from the service manual

Check compressor wire connections, service valve, EEV motor

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

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  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
  • Verified part numbers when replacement is required
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What OUTDOOR_YELLOW_FLICKER_GREEN_FLICKER means on a Samsung air conditioner

The OUTDOOR_YELLOW_FLICKER_GREEN_FLICKER error on a Samsung air conditioner indicates a compressor rotation error, signaled by alternating yellow and green LED flicker patterns on the outdoor unit. This fault means the outdoor unit's control board has detected that the compressor is not rotating correctly, either failing to start, rotating in the wrong direction, or losing synchronization during operation. The inverter drive circuit monitors compressor feedback signals to confirm proper motor rotation, and when those signals fall outside expected parameters, this error is triggered and the system shuts down to prevent mechanical damage.

The first diagnostic steps focus on three key areas: compressor wire connections, the service valve, and the electronic expansion valve (EEV) motor. Loose, corroded, or miswired compressor terminals can disrupt phase signals and cause the inverter board to misread rotation. A closed or partially closed service valve restricts refrigerant flow, which can starve the compressor and prevent it from building the pressure differential needed to sustain rotation. A faulty EEV motor that fails to open properly will similarly restrict refrigerant delivery to the compressor.

Beyond wiring and valves, the root cause may be internal to the compressor itself, such as a seized motor winding, failed start capacitor on applicable models, or a damaged inverter board that is not delivering correct three-phase output to drive the compressor motor. Refrigerant issues, including an overcharged or undercharged system, can also generate abnormal suction and discharge pressures that prevent stable compressor rotation.

Source: manufacturer service documentation.

Common causes of OUTDOOR_YELLOW_FLICKER_GREEN_FLICKER

  1. 01

    Loose or faulty compressor wire connections

    Wiring / connection

    Corroded, loose, or improperly connected wiring at the compressor terminals can disrupt the phase signals the inverter board uses to confirm rotation. Inspect all compressor wiring harnesses and terminal connections for damage, looseness, or corrosion.

  2. 02

    Closed or partially closed service valve

    Wiring / connection

    If the liquid or suction service valve was not fully opened after installation or maintenance, refrigerant flow to the compressor is restricted, preventing proper rotation. Confirm both service valves are fully open by checking the valve stem positions.

  3. 03

    EEV motor failure

    Part replacement

    A failed or stuck electronic expansion valve motor will prevent refrigerant from flowing at the correct rate to the compressor, causing abnormal pressures that disrupt rotation. The EEV can be tested by listening for its characteristic stepping sound at startup or by measuring coil resistance.

  4. 04

    Failed or seized compressor

    Part replacement

    Internal mechanical seizure or winding failure in the compressor itself will cause a rotation error regardless of correct wiring and refrigerant conditions. Measuring compressor winding resistance and checking for shorts to ground can help confirm this failure.

  5. 05

    Inverter control board fault

    Part replacement

    If the outdoor inverter board is not delivering the correct voltage and frequency output to drive the compressor motor, a rotation error will result even if the compressor is mechanically sound. This is typically diagnosed after ruling out wiring, valve, and compressor faults.

See the test procedure for each cause

Frequently asked questions about OUTDOOR_YELLOW_FLICKER_GREEN_FLICKER

What does OUTDOOR_YELLOW_FLICKER_GREEN_FLICKER mean on a Samsung air conditioner?
This error code indicates a compressor rotation error detected by the outdoor unit's control board. The alternating yellow and green LED flicker pattern is Samsung's visual signal that the compressor is not starting or rotating correctly. The system shuts down automatically to protect the compressor from further damage. A technician should check compressor wiring, service valves, and the EEV motor as initial diagnostic steps.
Can I fix the OUTDOOR_YELLOW_FLICKER_GREEN_FLICKER error myself?
Some causes of this error, such as a closed service valve or a visibly loose wire connection at the compressor terminals, can be identified by a knowledgeable homeowner. However, diagnosing EEV motor faults, inverter board output, or compressor winding failures requires specialized tools and training. Because this error involves high-voltage inverter components and refrigerant systems, professional service is strongly recommended for most repair steps.
Is it safe to keep running my Samsung air conditioner with this error?
No. The unit has already shut itself down upon detecting the compressor rotation error, and attempting to force it to restart repeatedly without resolving the underlying cause can cause additional damage to the compressor or inverter board. Leave the unit off and contact a qualified technician before resuming operation.
How much does it cost to repair a compressor rotation error on a Samsung air conditioner?
Repair costs vary widely depending on the root cause. Correcting wiring or opening a service valve may cost only a service call fee, typically in the range of $75 to $150. Replacing an EEV motor or inverter board can range from $200 to $600 or more including parts and labor. A failed compressor is the most expensive scenario, with replacement costs ranging from $800 to $2,000 or higher depending on the unit size and refrigerant type.
Will resetting my Samsung air conditioner clear the OUTDOOR_YELLOW_FLICKER_GREEN_FLICKER error?
A power reset may temporarily clear the error and allow the unit to attempt a restart, but if the underlying cause such as a faulty EEV motor, closed service valve, or damaged compressor winding is still present, the error will return quickly. Resetting without diagnosis does not fix the problem and may delay needed repairs. The fault should be properly diagnosed and corrected before returning the unit to service.

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