Samsung Air Conditioner Error Code P510

P510 is a compressor protection shutdown triggered by the low pressure sensor detecting suction pressure below the safe operating limit. The system stops the compressor to prevent internal damage from running under low-refrigerant or restricted-flow conditions. The fault points to issues with refrigerant charge, service valve position, or the electronic expansion valve. A technician should inspect the system with manifold gauges before restarting.

The unit has already shut down the compressor automatically, so it will not run in its current state. Do not attempt to repeatedly reset and force the system to restart without addressing the root cause. Running a compressor under low pressure conditions can cause serious internal damage, turning a relatively inexpensive refrigerant or valve repair into a costly compressor replacement.

A reset may temporarily clear the fault and allow the unit to start, but if the underlying pressure problem has not been corrected, P510 will return quickly. Repeated resets without repair risk damaging the compressor. The error should be treated as a diagnostic alert requiring inspection with manifold gauges and a review of service valve position and EEV operation before the system is returned to normal use.

Some basic checks are within reach of a knowledgeable homeowner, such as confirming the service valves are fully open and visually inspecting the refrigerant lines for obvious kinks or frost. However, checking refrigerant pressure, diagnosing the EEV, and handling refrigerant require certified HVAC technicians and specialized equipment. Attempting to add refrigerant without the proper tools and certification is not recommended and may be illegal.

Repair costs vary significantly depending on the cause. A service valve adjustment or a minor refrigerant top-off after leak repair may cost anywhere from $150 to $400 for labor and refrigerant. An EEV replacement or pressure sensor replacement typically runs $200 to $600 depending on the unit and labor rates. If the compressor has sustained damage from repeated low-pressure operation, costs can rise substantially higher.