Samsung Air Conditioner Error Code P504

P504 indicates an outdoor unit overload 1 protection control error. The system has detected that the outdoor unit compressor is operating under excessive load conditions and has activated a protective shutdown to prevent component damage. This is a safety response, not a simple nuisance fault, and requires investigation before the unit is restarted.

No, you should not attempt to bypass or ignore the P504 fault. The overload protection system activates specifically to prevent compressor burnout or electrical damage. Continuing to operate the unit without resolving the underlying cause risks permanent and costly compressor failure. Leave the unit off until a technician has diagnosed and corrected the problem.

Powering the unit off and back on may temporarily clear the P504 code, but the fault will return if the underlying overload condition has not been corrected. Repeatedly resetting the unit without addressing the root cause can accelerate compressor wear and lead to more serious damage. A proper diagnosis should be completed before resuming normal operation.

Some causes of P504 can be addressed by a knowledgeable DIYer, such as cleaning dirty condenser coils or checking that the outdoor unit has adequate clearance and airflow. However, diagnosing refrigerant charge issues, testing compressor windings, or checking electrical supply voltage under load typically requires a licensed HVAC technician with proper tools and refrigerant handling certification.

Repair costs vary widely depending on the root cause. Cleaning condenser coils may cost between $75 and $200 for a professional service call. Refrigerant adjustments typically run $150 to $400 depending on the amount needed and refrigerant type. Compressor replacement, if required, is significantly more expensive, often ranging from $800 to $2,000 or more including labor and parts.