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Error code reference

Samsung Air Conditioner Error Code YEL_FLICKER_GRN_ON

Discharge sensor temperature trip

Samsung codesSamsung air conditioner codes

Discharge sensor temperature trip

First step from the service manual

Check ventilation, refrigerant charge, compressor condition

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

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What YEL_FLICKER_GRN_ON means on a Samsung air conditioner

The YEL_FLICKER_GRN_ON error code on Samsung air conditioners indicates a discharge sensor temperature trip. This means the thermistor monitoring the discharge line, which measures the temperature of the refrigerant vapor leaving the compressor, has detected a temperature that exceeds the safe operating threshold. The discharge line is one of the most thermally stressed points in the refrigeration circuit, and abnormally high temperatures at this location typically signal that the compressor is working under excessive load or that heat rejection is compromised.

The most common root causes fall into three categories: restricted airflow, refrigerant charge issues, and compressor faults. Blocked condenser coils, failed condenser fan motors, or inadequate clearance around the outdoor unit can all reduce the system's ability to reject heat, driving discharge temperatures upward. A low refrigerant charge causes the compressor to superheat the reduced mass of vapor more aggressively, which also elevates discharge temperatures. Conversely, a refrigerant overcharge or a restriction in the liquid line can cause similar symptoms by altering the pressure-temperature relationship in the cycle.

Compressor condition is also a key diagnostic factor. Internal wear or valve failures inside the compressor can reduce pumping efficiency, causing the compressor to run hotter than normal. When investigating this code, technicians should begin by verifying adequate ventilation around the outdoor unit, checking system refrigerant pressures against the rated charge specifications, and assessing compressor amp draw and discharge line temperature directly with instrumentation before condemning any single component.

Source: manufacturer service documentation.

Common causes of YEL_FLICKER_GRN_ON

  1. 01

    Restricted airflow at the outdoor unit

    Wiring / connection

    Blocked condenser coils, debris around the unit, or a failed condenser fan motor reduce heat rejection and cause discharge temperatures to spike. Inspect the outdoor unit for obstructions and verify the condenser fan is spinning at normal speed.

  2. 02

    Low refrigerant charge

    Part replacement

    Insufficient refrigerant causes the compressor to overheat the smaller mass of vapor circulating in the system, raising discharge line temperatures above the trip threshold. This requires checking system pressures with manifold gauges and locating any leak before recharging.

  3. 03

    Refrigerant overcharge or system restriction

    Wiring / connection

    Too much refrigerant or a blockage in the liquid line or expansion device can disrupt the pressure-temperature balance, increasing compressor discharge temperature. Abnormal high-side and low-side pressure readings will help identify this condition.

  4. 04

    Faulty discharge temperature sensor

    Part replacement

    A defective thermistor on the discharge line may report falsely elevated temperatures and trigger the protection circuit even when actual conditions are normal. Resistance testing of the sensor against the rated specification can confirm whether it has drifted out of range.

  5. 05

    Compressor internal wear or valve failure

    Part replacement

    A mechanically degraded compressor can run inefficiently and generate excessive heat, causing legitimate discharge temperature trips. High amp draw, abnormal suction and discharge pressures, and elevated compressor body temperature are indicators of internal compressor problems.

See the test procedure for each cause

Frequently asked questions about YEL_FLICKER_GRN_ON

What does YEL_FLICKER_GRN_ON mean on a Samsung air conditioner?
This code indicates a discharge sensor temperature trip, meaning the temperature of the refrigerant gas exiting the compressor has exceeded the safe limit. Samsung's control board uses this signal to shut down the system and prevent compressor damage. The code is displayed through a specific LED indicator pattern, with the yellow LED flickering while the green LED stays on. Ventilation, refrigerant charge, and compressor condition are the primary areas to investigate.
Can I fix the YEL_FLICKER_GRN_ON error myself?
Some causes, such as clearing debris from around the outdoor unit or ensuring adequate clearance for airflow, can be addressed without professional tools. However, diagnosing refrigerant charge issues requires manifold gauges and EPA certification to handle refrigerants legally, and compressor diagnostics require electrical test equipment. For anything beyond basic airflow checks, a licensed HVAC technician should perform the repair.
Is it safe to keep running my air conditioner when this error appears?
No. This error code triggers a protective shutdown specifically to prevent compressor damage from overheating. Attempting to bypass the shutdown or repeatedly resetting the unit without resolving the underlying cause can result in permanent compressor failure, which is one of the most expensive components to replace in the system. Leave the unit off until the root cause has been diagnosed and corrected.
Will resetting the unit clear the YEL_FLICKER_GRN_ON error?
A power reset may temporarily clear the code and allow the unit to restart, but if the underlying cause is not corrected, the error will return, often quickly. Repeatedly resetting the unit while the fault condition persists accelerates wear on the compressor. A reset is only appropriate after a confirmed repair has been made or as part of an initial diagnostic step to observe whether the fault returns immediately.
How much does it cost to repair the YEL_FLICKER_GRN_ON error on a Samsung air conditioner?
Repair costs vary widely depending on the cause. A simple condenser cleaning or sensor replacement can range from around $75 to $250 including labor. Refrigerant leak repair and recharge typically costs between $200 and $600 depending on the refrigerant type, leak location, and labor rates in your area. Compressor replacement is the most expensive outcome, generally ranging from $800 to $2,000 or more depending on the unit size and parts availability.

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