Samsung Air Conditioner Error Code YEL_FLICKER_RED_FLICKER_GRN_ON

The YEL_FLICKER_RED_FLICKER_GRN_ON error code on a Samsung air conditioner indicates a DC-Link voltage sensor error. The DC-Link is a critical section of the inverter drive circuit located on the outdoor control board. It sits between the rectifier stage and the inverter output stage, storing and smoothing high-voltage DC power that is used to drive the variable-speed compressor. A sensor on this DC-Link rail monitors voltage levels continuously, and when the signal from that sensor falls outside expected parameters or is lost entirely, the system flags this fault and shuts down to prevent damage to the compressor or power electronics.

The outdoor control board contains the DC-Link voltage sensing circuit as an integrated component. Because the sensor and its associated circuitry are not serviceable as standalone parts, a fault in this sensing function points directly to the outdoor control board as the failed component. Causes can include failed sensing resistors or capacitors within the measurement circuit, a corrupted feedback signal, or broader inverter board failure resulting from voltage spikes, power surges, or component aging. The LED indicator pattern, yellow flickering, red flickering, and green on, is how the outdoor unit communicates this specific fault condition through its diagnostic indicator array.

The first and primary diagnostic step is replacement of the outdoor control board. Before replacing the board, technicians should confirm that incoming AC power supply voltage is within the unit's rated specification and that there are no loose or corroded connections on the high-voltage DC circuit. However, since the sensor itself is integrated into the board, board replacement is the corrective action when this error is present.