Samsung Air Conditioner Error Code P516

P516 means the outdoor unit discharge temperature has exceeded its safe operating limit, activating a protection control response. The discharge temperature is measured at the point where refrigerant exits the compressor. The system enters protection mode to prevent compressor damage. A technician needs to identify whether the cause is low refrigerant, poor airflow, a failed fan, or a faulty sensor.

No, you should not attempt to force the unit to run while P516 is active. The protection control exists to prevent the compressor from sustaining heat-related damage. Continuing to operate the system with an unresolved discharge temperature problem can lead to compressor failure, which is significantly more costly to repair than the underlying cause of P516.

Repair costs vary widely depending on the cause. Cleaning the condenser coil is typically inexpensive, ranging from around $75 to $200 for a service call. Refrigerant recharge can range from $150 to $400 or more depending on refrigerant type and the amount needed. Replacing a discharge temperature sensor generally falls in the $100 to $300 range including labor, while compressor replacement is significantly more expensive, often $800 to $2,000 or higher.

Some causes, like clearing debris from the outdoor condenser coil, can be handled without professional help. However, diagnosing refrigerant charge issues, testing the discharge temperature sensor, or evaluating the compressor requires specialized tools and EPA certification for refrigerant handling. Most homeowners should contact a certified HVAC technician for this error.

A power reset may temporarily clear the error code and allow the unit to restart, but if the underlying problem is not resolved, P516 will return once the discharge temperature exceeds the protection threshold again. Repeated resets without addressing the root cause increase the risk of permanent compressor damage. The error should be properly diagnosed before relying on a reset.