Samsung Air Conditioner Error Code E506

E506 indicates that the Samsung air conditioner has detected a fault through its self-diagnosis routine involving the low pressure sensor. The low pressure sensor monitors the refrigerant suction pressure on the low side of the refrigeration cycle. The error can point to a failed sensor, a wiring problem, or an actual low refrigerant pressure condition. The unit shuts down to protect the compressor from operating under unsafe pressure conditions.

No, you should not continue operating the unit with an active E506 fault. The error indicates a problem with the component that protects the compressor from low-pressure damage. Running the compressor without proper low-pressure monitoring risks serious damage to the compressor, which is one of the most expensive components in the system.

A power reset may temporarily clear the E506 error, but it will return if the underlying fault is still present. If the sensor is defective, the wiring is damaged, or refrigerant pressure remains low, the unit will re-trigger the error during its self-diagnosis cycle upon restart. A reset is useful for confirming whether the error is intermittent, but it is not a fix and should not be relied upon as a solution.

Some basic checks, such as inspecting the sensor wiring and connector for visible damage or corrosion, can be done without specialized tools. However, diagnosing whether the sensor has actually failed or whether the refrigerant charge is low requires a manifold gauge set and EPA certification to handle refrigerants. Most repairs beyond wiring inspection should be handled by a qualified HVAC technician.

Repair costs depend on the root cause. A low pressure sensor replacement typically falls in the range of $100 to $300 including parts and labor. If the system requires refrigerant recharge due to a leak, costs can range from $200 to $600 or more depending on refrigerant type and leak repair complexity. A control board replacement, if needed, can add $300 to $700 or more to the repair cost.