Samsung Air Conditioner Error Code OUTDOOR_YELLOW_ON

OUTDOOR_YELLOW_ON indicates a heatsink temperature trip in the outdoor unit. The heatsink, which dissipates heat from the inverter power electronics, has exceeded its safe operating temperature. The system shuts down to protect the power module and PCB from thermal damage. The yellow LED on the outdoor unit board illuminates to signal this specific fault condition.

No, you should not attempt to bypass or ignore this fault. The error exists to protect the inverter power module from heat damage, which can result in expensive board failure. Continue operating the unit only after the root cause has been identified and corrected.

Repair costs depend on the cause. Clearing a blockage costs nothing beyond a service call fee, which typically runs in the range of $75 to $150. Replacing an outdoor fan motor generally costs between $150 and $400 including labor. Outdoor PCB replacement is the most expensive scenario, often ranging from $300 to $600 or more depending on the unit model and labor rates in your area.

Start by checking for any objects, debris, or plant growth blocking airflow around the outdoor unit and clear them away. Next, confirm the outdoor fan is spinning freely and running when the unit operates. If the fan and airflow are both fine, the outdoor PCB fan drive circuit or the heatsink temperature sensor may need professional testing and possible replacement.

A power reset may temporarily clear the fault and allow the unit to restart, but the error will return if the underlying cause is not addressed. If the heatsink is overheating due to a blocked fan or failed motor, the trip will occur again quickly. Resetting is useful for confirming the fault but is not a repair.