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Error code reference

Samsung Air Conditioner Error Code OUTDOOR_YELLOW_ON

Heatsink temperature trip

Samsung codesSamsung air conditioner codes

Heatsink temperature trip

First step from the service manual

Check ventilation, fan motor, fan motor drive circuit, and air flow blocking

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What OUTDOOR_YELLOW_ON means on a Samsung air conditioner

The OUTDOOR_YELLOW_ON error on a Samsung air conditioner indicates a heatsink temperature trip in the outdoor unit. The heatsink is the aluminum heat-dissipating component mounted directly to the inverter power module (IPM) or compressor drive board. When the heatsink reaches an unsafe temperature threshold, the system triggers this fault to prevent thermal damage to the power electronics. The yellow LED on the outdoor unit PCB illuminates as the visual indicator of this condition.

The heatsink relies on adequate airflow and a functioning fan motor to stay within operating temperature limits. If the outdoor unit fan motor slows, stops, or if airflow through the unit is restricted, heat builds up on the heatsink faster than it can dissipate. The fan motor drive circuit, which controls motor speed and direction, can also contribute if it is delivering incorrect voltage or failing to respond to control board commands.

Diagnosis should begin with a physical inspection of the outdoor unit for blocked airflow, such as debris, vegetation, or objects pressed against the cabinet. After confirming airflow is clear, the fan motor should be tested for proper rotation and current draw. The fan motor drive circuit on the outdoor PCB should be inspected for burnt components or failed capacitors. If airflow and the motor check out, the heatsink thermal sensor itself may be reading incorrectly, requiring further electrical testing of the sensor and its circuit.

Source: manufacturer service documentation.

Common causes of OUTDOOR_YELLOW_ON

  1. 01

    Blocked airflow to outdoor unit

    Wiring / connection

    Debris, leaves, dirt buildup, or objects placed too close to the outdoor cabinet restrict airflow across the heatsink. Inspect all sides and the top of the outdoor unit for obstructions.

  2. 02

    Outdoor fan motor failure

    Part replacement

    A fan motor that has seized, is running slowly, or has failed completely will not move enough air to cool the heatsink. Check that the fan blade spins freely and that the motor runs at startup.

  3. 03

    Fan motor drive circuit fault

    Part replacement

    The fan motor drive circuit on the outdoor PCB controls motor speed and operation. A failed driver component can cause the fan to run incorrectly or not at all even if the motor itself is functional.

  4. 04

    Heatsink thermal sensor malfunction

    Part replacement

    If the thermistor or sensor mounted on the heatsink has drifted out of spec or failed, it can report falsely elevated temperatures and trigger a trip even when actual temperatures are normal.

  5. 05

    High ambient temperature with heavy load

    Wiring / connection

    Operating the unit in extreme ambient heat, especially when the outdoor unit is in direct sun with poor clearance, can push heatsink temperatures beyond trip thresholds even with all components working correctly.

See the test procedure for each cause

Frequently asked questions about OUTDOOR_YELLOW_ON

What does OUTDOOR_YELLOW_ON mean on a Samsung air conditioner?
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.
How do I fix the OUTDOOR_YELLOW_ON error on my Samsung air conditioner?
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.
Is it safe to keep running my Samsung air conditioner with the OUTDOOR_YELLOW_ON error?
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.
Will resetting the unit clear the OUTDOOR_YELLOW_ON error?
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.
How much does it cost to repair the OUTDOOR_YELLOW_ON error on a Samsung air conditioner?
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.

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