Samsung Air Conditioner Error Code YEL_FLICKER_GRN_FLICKER

The YEL_FLICKER_GRN_FLICKER error code on a Samsung air conditioner indicates a compressor starting error, meaning the system attempted to start the compressor but failed to detect successful startup. This error is signaled by alternating yellow and green LED flickers on the indoor or outdoor unit's diagnostic display. The compressor is the core refrigerant compression component in the refrigeration circuit, and a failure to start it properly prevents the entire cooling or heating cycle from initiating. The control board monitors feedback signals from the compressor circuit to confirm startup, and when that confirmation is absent or out of specification, this code is triggered.

Three primary areas are implicated in this fault: the compressor TAB terminal connections, the service valve position, and the Electronic Expansion Valve (EEV) motor. Loose, corroded, or improperly seated TAB terminal connections at the compressor can prevent adequate electrical contact, resulting in insufficient current delivery to start the compressor motor windings. A closed or partially closed service valve restricts refrigerant flow, which can cause abnormal suction or discharge pressure conditions that prevent the compressor from starting under the resulting load. The EEV motor controls refrigerant flow into the evaporator, and a failed or stalled EEV motor can create pressure imbalances that similarly prevent compressor startup.

Diagnosis should begin at the compressor TAB terminals to verify secure, corrosion-free connections, followed by confirming both service valves are fully open. The EEV motor coil resistance should also be measured and compared against specification to rule out a motor winding failure. If electrical connections and refrigerant circuit access are confirmed normal, internal compressor winding resistance checks may be necessary to determine if the compressor itself requires replacement.