Samsung Air Conditioner Error Code OUTDOOR_RED_FLICKER_GREEN_ON

This LED pattern on the outdoor unit indicates a discharge temperature sensor error, specifically an open or short circuit in the sensor circuit at connector CN51 pins 3 and 4. The discharge sensor monitors refrigerant temperature at the compressor outlet, and the control board has detected a reading that falls outside any valid temperature range. The unit will not operate normally until this fault is resolved to protect the compressor from potential damage.

No, you should not attempt to bypass or ignore this error. The discharge temperature sensor is a compressor protection component, and operating the system without a functioning sensor removes an important safeguard against compressor overheating. Continued operation under this fault condition could lead to compressor failure, which is a significantly more expensive repair.

Repair costs vary depending on what has failed. A replacement discharge temperature sensor typically costs in the range of $15 to $60 for the part, with labor adding $75 to $200 depending on the technician and region. If the outdoor control board has failed, parts and labor combined can range from $300 to $600 or more. Getting a diagnostic visit first is the most cost-effective approach before committing to parts.

A knowledgeable DIYer can inspect the wiring harness and connector at CN51 for visible damage, corrosion, or loose pins without special tools. However, testing sensor resistance requires a multimeter, and replacing components inside the outdoor unit of a refrigerant-handling system should be done by a qualified technician in most regions. If the control board requires replacement, professional diagnosis is strongly recommended.

A power reset may temporarily clear the fault display, but the error will return if the underlying sensor or wiring problem has not been corrected. Because this is a hardware fault caused by an open or short circuit, the control board will re-detect the invalid sensor reading as soon as it powers up and begins monitoring. The root cause must be repaired to permanently clear the code.