Samsung Air Conditioner Error Code OUTDOOR_YELLOW_GREEN_FLICKER_RED_ON

The OUTDOOR_YELLOW_GREEN_FLICKER_RED_ON error code on the Samsung SH12BWHX outdoor unit indicates a DC fan motor fault. This code is specific to that model and is communicated through a combination of LED indicator behavior on the outdoor control board: the yellow-green LED flickers while the red LED remains solid. The DC fan motor in the outdoor unit is responsible for drawing air across the condenser coil to reject heat from the refrigerant. When the control board detects an abnormal signal from the fan motor, such as a missing feedback pulse or out-of-range RPM, it flags this fault condition.

The first diagnostic step is to inspect the fan motor's wiring harness connection at connector CN01 on the outdoor control board. A loose, corroded, or damaged connector at this point can interrupt the PWM control signal or the Hall sensor feedback signal, causing the board to register a DC fan error even if the motor itself is functional. DC fan motors on outdoor units rely on continuous rotor position feedback from built-in Hall effect sensors, and any interruption in that signal chain will trigger this fault.

If the CN01 connection is secure and undamaged, the fault likely lies with the DC fan motor itself or with the outdoor control board. DC fan motor failures often result from winding insulation breakdown, bearing seizure, or internal Hall sensor failure. The control board can also develop driver circuit faults that prevent proper motor commutation. Resistance checks on the motor windings and verification of supply voltage at CN01 are the appropriate next steps after confirming connector integrity.