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Error code reference

Samsung Air Conditioner Error Code YEL_ON_RED_FLICKER_GRN_ON

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 condition

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

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What YEL_ON_RED_FLICKER_GRN_ON means on a Samsung air conditioner

The YEL_ON_RED_FLICKER_GRN_ON error code on a Samsung air conditioner indicates that the Overload Protector (OLP) sensor has detected an over-temperature condition and tripped the circuit. The OLP is a thermal protection device mounted on or near the compressor that monitors operating temperature. When the compressor or surrounding components reach a temperature threshold beyond safe operating limits, the OLP interrupts compressor operation to prevent damage. This fault is signaled through the LED indicator pattern: yellow steady, red flickering, and green steady.

The most immediate area to investigate is system ventilation. Blocked airflow around the outdoor unit, dirty condenser coils, or a failed condenser fan motor can all cause heat to accumulate around the compressor, driving temperatures high enough to trip the OLP. Refrigerant charge level is also a critical factor: both low refrigerant and an overcharged system alter operating pressures and compressor load, which directly affects heat generation. A system running with incorrect refrigerant levels will often cause the compressor to work harder and run hotter than designed.

Beyond airflow and refrigerant, the compressor itself may be the root cause. An aging or failing compressor can draw excessive current and generate abnormal heat even under correct refrigerant charge and adequate airflow. The condenser fan motor should also be inspected for reduced RPM, seized bearings, or failed capacitors, any of which can reduce heat dissipation at the outdoor coil and contribute to an OLP trip. Addressing all four areas systematically is necessary before clearing the fault and returning the unit to service.

Source: manufacturer service documentation.

Common causes of YEL_ON_RED_FLICKER_GRN_ON

  1. 01

    Restricted airflow or blocked condenser

    Wiring / connection

    Debris, vegetation, or dirt buildup around or on the outdoor unit restricts heat dissipation, causing compressor temperatures to rise and trip the OLP. Visually inspect and clear at least 18 inches of clearance around the unit and clean the condenser coil fins.

  2. 02

    Low or incorrect refrigerant charge

    Part replacement

    An undercharged system forces the compressor to work harder under reduced suction pressure, generating excess heat. A licensed technician must measure system pressures to confirm refrigerant level and locate any leak before recharging.

  3. 03

    Condenser fan motor failure or reduced output

    Part replacement

    A failed or weakened condenser fan motor reduces airflow across the outdoor coil, allowing heat to build up around the compressor. Check that the fan spins freely, runs at correct speed, and that the run capacitor is functioning properly.

  4. 04

    Failing or overloaded compressor

    Part replacement

    A compressor with worn internal components can draw excessive current and generate abnormal heat even when refrigerant charge and airflow are correct. Measure compressor amp draw and compare to the rated full load amps on the unit nameplate.

  5. 05

    Faulty OLP sensor

    Part replacement

    In some cases the OLP device itself may be defective, tripping at temperatures below the actual fault threshold. This should only be considered after all other causes have been ruled out through proper diagnosis.

See the test procedure for each cause

Frequently asked questions about YEL_ON_RED_FLICKER_GRN_ON

What does YEL_ON_RED_FLICKER_GRN_ON mean on a Samsung air conditioner?
This LED indicator pattern signals that the Overload Protector (OLP) sensor has tripped due to an over-temperature condition at or near the compressor. The OLP is a safety device that shuts down the compressor when temperatures exceed safe operating limits. The fault typically points to problems with ventilation, refrigerant charge, the condenser fan motor, or the compressor itself. The system will not resume normal cooling until the underlying cause is identified and corrected.
Can I fix the YEL_ON_RED_FLICKER_GRN_ON error myself?
Some causes, such as clearing debris from around the outdoor unit or removing obstructions blocking airflow, can be addressed without professional tools. However, diagnosing refrigerant charge issues requires certified HVAC equipment and a licensed technician. Compressor and fan motor testing also requires electrical knowledge and proper safety precautions, so those steps are best handled by a qualified technician.
Is it safe to keep running my Samsung air conditioner when this error appears?
No. The OLP has already interrupted compressor operation as a protective measure, and the unit should not be forced back into service without identifying the root cause. Repeatedly resetting the unit and running it under the fault condition can cause permanent compressor damage, which is the most costly component to replace. Address the underlying problem before restoring normal operation.
Will resetting the unit clear the YEL_ON_RED_FLICKER_GRN_ON error?
Powering the unit off and allowing the compressor to cool may temporarily clear the OLP trip and allow the system to restart. However, if the underlying cause such as blocked airflow, low refrigerant, or a failing fan motor is not resolved, the OLP will trip again, often within a short period. A reset is only useful as part of a diagnostic process, not as a permanent fix.
How much does it cost to repair the issue behind the YEL_ON_RED_FLICKER_GRN_ON error?
Repair costs vary widely depending on the root cause. Cleaning the condenser and improving airflow is generally low cost, in the range of $75 to $200 for a service call. Refrigerant leak repair and recharge typically runs $200 to $600 or more depending on the refrigerant type and leak location. Condenser fan motor replacement generally falls in the $150 to $400 range, while compressor replacement is the most expensive outcome, often ranging from $800 to $2,000 or higher including labor.

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