Samsung Air Conditioner Error Code OUTDOOR_GREEN_RED_FLICKER

This error code indicates a CT sensor error in the outdoor unit. The CT sensor monitors electrical current through the outdoor unit components, and when the control board cannot receive a valid signal from it, the outdoor unit's green and red LEDs will flicker and the system will stop operating normally. The fault can originate from the CT sensor itself, its wiring, or the outdoor control board.

No, you should not attempt to run the unit while this error is active. The CT sensor protects the compressor from overcurrent conditions, and operating without a valid sensor reading removes that protection. Continued operation could result in compressor damage or an electrical safety hazard.

A power reset may temporarily clear the error code, but it will return if the underlying hardware fault is still present. The CT sensor error is triggered by a real electrical signal problem, not a software glitch, so resetting the unit does not address the root cause. A proper component inspection and repair is required to permanently resolve the fault.

The first recommended step is to replace the outdoor control board, as a board failure is a primary cause of this error. If replacing the board does not resolve the fault, the CT sensor and its wiring harness should be inspected for damage, loose connections, or corrosion. This repair involves working inside the outdoor unit with high-voltage components and should be performed by a qualified technician.

Repair costs vary depending on which component has failed. An outdoor control board replacement typically runs in the range of $200 to $500 including parts and labor. CT sensor replacement is generally less expensive, often in the $100 to $300 range. Diagnostic fees from an HVAC technician will also apply and vary by region.