Samsung Air Conditioner Error Code OUTDOOR_YELLOW_RED_FLICKER_GREEN_ON

This LED pattern on the Samsung outdoor unit indicates a deice sensor error, meaning the defrost temperature sensor has been detected as open circuit or short circuit. The sensor is located on the outdoor heat exchanger and connects to the control board at connector CN52 pins 3 and 4. The unit flags this fault because accurate defrost sensor data is required for safe and efficient heating operation.

Running the unit with an active deice sensor fault is not recommended. Without accurate defrost temperature data, the outdoor unit cannot manage ice buildup on the heat exchanger correctly, which can lead to reduced efficiency or potential damage to the unit. The outdoor unit may suspend heating operation automatically as a protection measure until the fault is resolved.

Repair costs vary depending on the cause. If the fix is simply reseating a loose connector, a service call fee alone may apply, typically in the range of $75 to $150. Replacing the deice sensor itself is generally a lower-cost repair, with parts and labor often falling between $100 and $250. If the outdoor control board has failed, costs can range from $300 to $600 or more depending on the unit model and labor rates in your area.

Start by inspecting the sensor connector at CN52 pins 3 and 4 on the outdoor control board for loose connections, bent pins, or corrosion. If the connection is secure, use a multimeter to test the resistance of the deice sensor across its terminals and check for infinite or zero resistance, which confirms sensor failure. Damaged wiring or a failed sensor will require component replacement, while a faulty outdoor control board is a less common but possible cause if the sensor and wiring test correctly.

A power reset may temporarily clear the error code display, but the fault will return if the underlying sensor or wiring problem has not been repaired. Because this error reflects a real hardware condition, either an open or short circuit in the deice sensor circuit, the root cause must be corrected before the code will stay cleared.