Samsung Air Conditioner Error Code OUTDOOR_ALL_FLICKER

The OUTDOOR_ALL_FLICKER error on a Samsung air conditioner indicates a temperature sensor fault originating in the outdoor unit. This code specifically covers four sensor circuits: the outdoor ambient temperature sensor, the deice (defrost) sensor, the OLP (overload protector) temperature sensor, and the discharge temperature sensor. When the control board detects an open circuit or short circuit in any of these sensor lines, it flags this error and may shut down outdoor unit operation to prevent compressor or refrigerant circuit damage.

Each of these sensors is a thermistor, meaning its resistance changes predictably with temperature. An open circuit condition occurs when the sensor or its wiring has a complete break, sending no signal to the control board. A short circuit occurs when the sensor resistance drops abnormally low, typically indicating internal sensor failure or wiring contact with a grounded surface. Both conditions produce readings outside the expected resistance range, triggering the fault.

The most reliable first step is to physically inspect each outdoor sensor and its associated wiring harness for visible damage, corrosion, or loose connector pins. After visual inspection, use a multimeter to measure resistance across each sensor at a known ambient temperature and compare the reading against the expected thermistor curve. A sensor reading near zero ohms indicates a short, while an infinite resistance reading indicates an open. Corroded or damaged connectors can also cause intermittent failures that mimic sensor faults, so connector condition should be evaluated as part of the diagnosis.