Samsung Air Conditioner Error Code YEL_ON_RED_ON_GRN_ON

The YEL_ON_RED_ON_GRN_ON error code on Samsung air conditioners indicates an overcurrent protection fault. This condition is triggered when the electrical current draw across the system exceeds safe operating thresholds, causing the protection circuit to shut down the unit. The three LED indicators (yellow, red, and green) illuminating simultaneously is the diagnostic signal used to communicate this specific fault state. Overcurrent protection exists to prevent damage to the compressor, fan motors, and associated electrical components when abnormal load conditions are detected.

The most common system areas involved in this fault are the compressor, the outdoor fan motor, and the refrigerant circuit. An improperly charged refrigerant system forces the compressor to work harder than designed, which drives up current consumption. A compressor with worn windings or developing mechanical failure will also draw excessive current, as will a fan motor that is seizing or has failed bearings. These conditions can all push current levels beyond the protection threshold and trigger this code.

Installation and ventilation issues also contribute directly to this fault. If the outdoor unit is installed in a location with restricted airflow, heat buildup causes the system to work harder to achieve heat exchange, increasing compressor load and current draw. Diagnosing this code should begin with verifying adequate clearance around the outdoor unit, confirming refrigerant charge is within specification, and physically inspecting the compressor and fan motor for signs of mechanical stress or electrical failure.