Samsung Air Conditioner Error Code YEL_ON_RED_ON_GRN_FLICKER

This LED indicator pattern signals a deice sensor error, meaning the control board has detected either an open circuit or a short circuit in the deice temperature sensor. The deice sensor monitors the evaporator coil for ice buildup and is a critical part of the defrost system. The unit will not operate normally until the sensor fault is resolved. Diagnosis begins at connector CN52, pins 3 and 4, where the sensor connects to the control board.

No, you should not continue running the unit with this error active. The deice sensor is part of the defrost protection system, and without accurate sensor data, the evaporator coil could develop excessive ice buildup that restricts airflow and can cause compressor damage. The unit may already be locked out of normal operation as a protective measure. Power down the system and address the sensor fault before resuming use.

A power reset may temporarily clear the error display, but the code will return if the underlying sensor fault is still present. Because this error reflects an actual electrical fault, either an open or a short circuit in the deice sensor circuit, resetting without repairing the root cause will not resolve the problem. The fault at CN52 pins 3 and 4 must be diagnosed and corrected for the error to clear permanently.

A knowledgeable DIYer can perform basic checks such as reseating the connector at CN52 and inspecting the wiring for visible damage. Testing the sensor resistance with a multimeter is also within reach if you are comfortable with electrical diagnostics. However, if the sensor or wiring harness needs replacement, or if the control board is involved, professional service is recommended to ensure correct parts and safe handling of refrigerant components nearby.

If only the connector needs reseating or minor wiring repair is required, costs are minimal, covering only a service call fee typically in the range of $75 to $150. Replacing the deice temperature sensor itself generally costs between $50 and $150 for the part plus labor. If the control board is the root cause, repair costs can range from $200 to $600 or more depending on the model and labor rates in your area.