Samsung Air Conditioner Error Code YEL_ON_GRN_ON_RED_FLICKER2

The YEL_ON_GRN_ON_RED_FLICKER2 error code on a Samsung air conditioner indicates a NO GAS condition, meaning the system has detected an insufficient refrigerant charge. This is signaled visually through a specific LED pattern: the yellow and green indicator lights remain solid while the red light flickers. The refrigerant circuit is responsible for absorbing and releasing heat between the indoor and outdoor units, and when the refrigerant level drops below the required operating threshold, the system cannot achieve proper heat exchange. Internal pressure sensors monitor the refrigerant circuit continuously, and a low-pressure reading triggers this fault condition.

The most common reason for a NO GAS error is refrigerant loss due to a leak somewhere in the system. Leaks can occur at flare fittings, brazed joints, the service valve connections, or through micro-cracks in the evaporator or condenser coil. In some cases, the refrigerant charge may have been insufficient from the initial installation rather than from an active leak. Either way, the correct first diagnostic step is to charge the system with the standard specified amount of refrigerant and monitor system pressures during operation.

Before recharging, a qualified technician should perform a leak search using an electronic leak detector or UV dye to identify and repair any active leaks. Simply recharging without addressing the source of the loss will result in the error returning. Refrigerant handling requires EPA Section 608 certification in the United States, so this repair must be performed by a licensed professional.