Samsung Air Conditioner Error Code OUTDOOR_YELLOW_GREEN_RED_FLICKER

The OUTDOOR_YELLOW_GREEN_RED_FLICKER error on a Samsung air conditioner indicates an over current protection event in the outdoor unit. This condition is triggered when the electrical current drawn by one or more components in the outdoor unit exceeds safe operating thresholds. The control board monitors current levels continuously, and when a spike or sustained over-limit condition is detected, the system shuts down to prevent damage to the compressor, motor windings, or control electronics. The flicker pattern of the yellow, green, and red LEDs on the outdoor unit is the diagnostic signal that identifies this specific fault.

Over current conditions in the outdoor unit most commonly originate from restricted airflow, refrigerant charge problems, a failing compressor, a faulty fan motor, or a defective current sensor block. Restricted airflow forces the compressor to work harder, increasing current draw. Low refrigerant charge causes the compressor to operate under abnormal suction and discharge pressures, which can also elevate current. A compressor with degraded windings or mechanical wear draws excessive current even under normal operating conditions. Similarly, a fan motor that is beginning to seize or has shorted windings will pull more current than normal.

The current sensor block itself is also a potential source of false positives. If the sensor has failed or drifted out of calibration, it may report over current conditions even when actual component current draw is within spec. Proper diagnosis requires checking each potential source systematically: confirming adequate airflow clearance around the outdoor unit, verifying refrigerant charge pressures, testing compressor winding resistance and current draw under load, inspecting the fan motor, and checking the current sensor block for correct output signal.