Samsung Air Conditioner Error Code P502

P502 indicates an outdoor unit freezing detection event at the second detection level. The system has identified that temperatures in the outdoor unit have dropped to a point associated with abnormal ice accumulation on the coil or refrigerant circuit. The fault is designed to protect the compressor and heat exchanger from damage caused by sustained freezing conditions.

It is not recommended to continue operating the unit with an active P502 fault. Sustained freezing at the outdoor unit can cause liquid refrigerant to return to the compressor, which leads to compressor damage that is costly to repair. The system may automatically limit or shut down operation as a protective measure, and this shutdown should be respected until the underlying cause is resolved.

Repair costs vary depending on the cause. Clearing airflow obstructions or replacing a thermistor is generally on the lower end, typically ranging from $75 to $200 including labor. Refrigerant recharge with leak detection and repair can range from $200 to $600 or more depending on the extent of the leak and the refrigerant type. Outdoor fan motor replacement typically falls in the $150 to $400 range depending on parts and labor rates in your area.

Some causes, such as clearing debris from around the outdoor unit or checking for airflow blockages, can be addressed without professional help. However, diagnosing and repairing refrigerant leaks, testing thermistor resistance, or replacing fan motor components requires proper tools and in most regions a licensed technician for any refrigerant handling. If the coil is visibly iced over, allow the unit to thaw completely before attempting any inspection.

A power reset may temporarily clear the fault display, but if the underlying cause is still present the code will return once the system resumes operation. Resetting without diagnosis is not a fix and can allow the freezing condition to recur, increasing the risk of component damage. The root cause, whether it is low refrigerant, poor airflow, or a faulty sensor, must be identified and corrected for the fault to stay cleared.