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Error code reference

Samsung Air Conditioner Error Code OUTDOOR_YELLOW_RED_FLICKER_GREEN_FLICKER

OLP sensor temperature trip

Samsung codesSamsung air conditioner codes

OLP sensor temperature trip

First step from the service manual

Check ventilation, refrigerant level, compressor and fan 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_RED_FLICKER_GREEN_FLICKER means on a Samsung air conditioner

The OUTDOOR_YELLOW_RED_FLICKER_GREEN_FLICKER error code on a Samsung air conditioner indicates an OLP (Over Load Protector) sensor temperature trip. The OLP is a thermal protection device integrated into the compressor circuit that monitors operating temperature. When the compressor or its surrounding environment exceeds safe thermal thresholds, the OLP trips and signals the control board, which responds by displaying this LED flicker pattern on the outdoor unit. The yellow LED steady, red LED flickering, and green LED flickering combination is the outdoor unit's way of communicating this specific fault condition.

The OLP trip is most commonly triggered by conditions that cause the compressor to overheat or work harder than its design limits allow. Restricted airflow around the outdoor unit prevents adequate heat dissipation from the condenser coil, causing refrigerant discharge temperatures to rise sharply. Low refrigerant charge is another primary cause, as insufficient refrigerant forces the compressor to run longer cycles at higher compression ratios, generating excess heat. A failing condenser fan motor that runs slowly or intermittently will also starve the system of the airflow needed to reject heat from the refrigerant.

Diagnosing this fault requires a systematic check of all factors that influence compressor thermal load. Start by inspecting the outdoor unit for blocked airflow, including debris on the coil, objects placed near the unit, or installation in a confined space. Next, connect manifold gauges to verify refrigerant pressures are within specification. Inspect the condenser fan motor for correct RPM and amp draw. Finally, evaluate compressor health directly, as an internally worn compressor with poor compression efficiency will generate excessive heat even under otherwise normal operating conditions.

Source: manufacturer service documentation.

Common causes of OUTDOOR_YELLOW_RED_FLICKER_GREEN_FLICKER

  1. 01

    Restricted airflow around outdoor unit

    Wiring / connection

    Debris, overgrown vegetation, or a cramped installation location can block condenser airflow, causing heat to build up rapidly around the compressor. Inspect all four sides of the outdoor unit and the top discharge area for obstructions.

  2. 02

    Low refrigerant charge

    Part replacement

    Insufficient refrigerant forces the compressor to operate at abnormal pressure ratios, increasing thermal load significantly. This is confirmed by checking suction and discharge pressures with manifold gauges.

  3. 03

    Condenser fan motor failure or weak performance

    Part replacement

    A fan motor running below rated speed or cycling on and off reduces airflow across the condenser coil, preventing adequate heat rejection. Check the motor for correct amperage draw and verify blade rotation speed.

  4. 04

    Compressor internal fault

    Part replacement

    A worn or failing compressor can generate excess heat due to poor internal compression efficiency or increased friction. This is typically identified after ruling out airflow and refrigerant issues, and confirmed with compressor amp draw and winding resistance tests.

  5. 05

    OLP sensor fault

    Part replacement

    The OLP sensor itself can fail and report a trip condition even when compressor temperatures are within normal range. This is considered after all external causes have been eliminated and the sensor's resistance or continuity readings are out of specification.

See the test procedure for each cause

Frequently asked questions about OUTDOOR_YELLOW_RED_FLICKER_GREEN_FLICKER

What does OUTDOOR_YELLOW_RED_FLICKER_GREEN_FLICKER mean on a Samsung air_conditioner?
This LED pattern on the Samsung outdoor unit indicates an OLP (Over Load Protector) sensor temperature trip. The OLP is a thermal safety device that shuts down the compressor when it detects excessive heat. The fault can stem from poor ventilation, low refrigerant, a weak condenser fan motor, or a failing compressor. The outdoor unit's LED combination of steady yellow with flickering red and green is how Samsung's control system communicates this specific fault.
Can I fix the OUTDOOR_YELLOW_RED_FLICKER_GREEN_FLICKER error myself?
Some causes are accessible to a knowledgeable DIYer, such as clearing debris from around the outdoor unit, straightening bent condenser fins, and ensuring the installation area is not enclosed or obstructed. However, diagnosing low refrigerant requires EPA-certified technicians and manifold gauge equipment, and replacing a compressor or fan motor involves high-voltage components and refrigerant handling. If clearing airflow restrictions does not resolve the fault, professional service is the appropriate next step.
Is it safe to keep running my air conditioner when this error appears?
No. The OLP trips specifically to protect the compressor from heat damage, and continuing to operate the system while the underlying cause is unresolved risks permanent compressor failure. A compressor replacement is among the most expensive repairs possible on an air conditioner, so addressing the root cause promptly is strongly recommended. Allow the unit to cool down before attempting any diagnostics.
Will resetting the unit clear the OUTDOOR_YELLOW_RED_FLICKER_GREEN_FLICKER error code?
A reset may temporarily clear the fault and allow the unit to restart once the compressor has cooled, but the error will return if the underlying cause is not corrected. Simply resetting without diagnosing the root issue, such as blocked airflow or low refrigerant, allows the same thermal stress to repeat and can accelerate component wear. A reset is useful as part of diagnostics but should not be treated as a fix.
How much does it cost to repair the cause of this error code?
Repair costs vary widely depending on the root cause. Clearing airflow obstructions may cost nothing beyond labor time, while a refrigerant recharge typically runs in the range of $150 to $400 depending on refrigerant type and system size. A condenser fan motor replacement generally falls between $150 and $350 for parts and labor. Compressor replacement is the most expensive scenario, often ranging from $800 to $2,000 or more, at which point evaluating the overall age and condition of the system is worthwhile.

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