Samsung Air Conditioner Error Code OUTDOOR_ALL_FLICKER

The OUTDOOR_ALL_FLICKER code indicates an error in one or more outdoor unit temperature sensors, specifically the outdoor ambient sensor, deice sensor, OLP temperature sensor, or discharge temperature sensor. The outdoor unit control board has detected an open or short circuit in one of these thermistor circuits. The system triggers this fault to protect the compressor and refrigerant circuit from operating under unmonitored temperature conditions.

Operating the unit while this fault is active is not advisable. The temperature sensors involved monitor critical conditions including compressor discharge temperature and outdoor coil defrost status. Without accurate readings from these sensors, the system cannot protect the compressor from overheating or ice buildup, which can lead to compressor failure or refrigerant circuit damage. The unit should remain off until the fault is diagnosed and resolved.

Repair costs vary depending on which sensor has failed and whether any wiring needs replacement. A single replacement thermistor sensor typically falls in the range of $15 to $60 for the part alone. With professional labor, total repair costs generally range from $100 to $300 depending on local service rates, accessibility of the unit, and whether multiple sensors or connectors need attention. Wiring harness replacement or control board involvement would increase costs further.

A knowledgeable DIYer can perform basic diagnostics such as inspecting wiring harnesses for visible damage, checking connector seating, and testing thermistor resistance with a multimeter. However, accessing the outdoor unit control board and sensor connectors requires disassembling the outdoor cabinet, and replacing a faulty sensor requires sourcing the correct thermistor. If the discharge sensor or OLP sensor is involved, the work is closer to the compressor and refrigerant lines, so professional service is recommended in those cases.

A power reset may temporarily clear the fault code if the error was caused by a momentary glitch or a briefly unseated connector. However, if any of the four outdoor sensors has genuinely failed or if there is real wiring damage, the code will return after the unit restarts and attempts to read the sensor circuits. Resetting without diagnosing the root cause does not fix the underlying problem.