Samsung Air Conditioner Error Code RED_ON_GRN_FLICKER

The RED_ON_GRN_FLICKER code signals a communication error between the indoor and outdoor units of your Samsung air conditioner. It is indicated by the red LED staying on while the green LED flickers. The system shuts down because the two units can no longer exchange the control signals needed to operate safely. The fault is typically in the communication cable or the control boards of one or both units.

No, the system will generally not continue running when this error is active, as it requires communication between units to operate safely. Attempting to force operation without resolving the fault could cause further damage to the control boards or other components. You should address the communication fault before returning the unit to service.

Repair costs vary depending on the cause. If the issue is simply a loose or corroded connection, a service call to inspect and reseat the wiring may cost in the range of $75 to $150. If the communication cable needs replacement, expect $100 to $250 depending on cable length and labor. A failed control board is the most expensive repair, typically ranging from $200 to $600 or more depending on the board and labor involved.

Start by powering off the system and inspecting the communication cable connections at both the indoor and outdoor units, tightening any loose terminal screws and looking for corrosion or damaged wiring. If the connections appear clean and secure, inspect the cable run between units for physical damage. If wiring is intact and correctly terminated, the fault may be in a control board, which will require board-level diagnosis or replacement by a qualified technician.

A power reset may temporarily clear the error display, but the code will return if the underlying communication fault is not resolved. Resetting without fixing the wiring or board issue is not a reliable solution. The root cause, whether a loose connection, damaged cable, or failed control board, must be corrected for the system to operate without returning the error.