Samsung Air Conditioner Error Code P506

The P506 error code on a Samsung air conditioner indicates an outdoor unit overload protection control error specifically tied to overload circuit 3. This protection system monitors the electrical load on the compressor and associated outdoor unit components. When the system detects that the current draw or thermal load has exceeded safe operating thresholds for the third overload protection circuit, it triggers this fault code and shuts down operation to prevent damage to the compressor, motor windings, or control board.

Overload protection in outdoor units typically involves thermal overload protectors embedded in or mounted on the compressor, along with current sensing components on the inverter or control board. The overload 3 designation suggests Samsung uses a multi-stage protection scheme, and P506 corresponds to a fault in the third stage. This can be triggered by actual overheating of the compressor, excessive refrigerant pressure, a failing compressor drawing abnormally high current, or a defective overload sensor or relay providing a false fault signal.

Common environmental and mechanical contributors include high ambient outdoor temperatures that push the system beyond its rated operating range, low refrigerant charge causing the compressor to work harder, dirty condenser coils restricting heat dissipation, or a failed condenser fan motor allowing heat to build up. Electrical issues such as low supply voltage or loose wiring connections can also force abnormally high current draw and trigger this protection circuit.