Samsung Air Conditioner Error Code OUTDOOR_RED_FLICKER_GREEN_FLICKER

The OUTDOOR_RED_FLICKER_GREEN_FLICKER error code on a Samsung air conditioner indicates an OLP (Overload Protector) sensor fault, specifically an open or short circuit condition detected in the OLP temperature sensor circuit. The OLP sensor monitors the compressor's operating temperature and pressure conditions to prevent damage from overheating or excessive load. When the outdoor unit control board detects that the sensor signal is outside its expected range, either reading no resistance (open circuit) or near-zero resistance (short circuit), it triggers this fault and signals the condition through the red and green LED flicker pattern on the outdoor unit.

The OLP sensor connects to the outdoor unit control board at connector CN52, pins 1 and 2. This is the first location to inspect when diagnosing this fault. A technician should check for continuity and resistance at the connector to determine whether the sensor itself has failed or whether the fault lies in the wiring between the sensor and the board. An open circuit reading typically points to a broken sensor element or a disconnected or corroded connector, while a short circuit reading usually indicates a failed sensor with an internal short or damaged wiring with insulation breakdown.

Common causes of sensor failure in outdoor units include physical damage from vibration, exposure to moisture or refrigerant contamination, and age-related degradation of the sensor element. If the wiring and connector at CN52 check out correctly but the sensor resistance reading is still out of specification, the OLP sensor itself requires replacement. In some cases, the outdoor control board may also be at fault if it is misinterpreting a valid sensor signal, though this is less common than a sensor or wiring issue.