Samsung Air Conditioner Error Code P515

P515 indicates that the outdoor unit has engaged its SUMP DOWN level 3 protection control. This means the system has detected conditions where liquid refrigerant may have accumulated in the compressor sump, which would be dangerous to the compressor if it attempted to start. The unit restricts operation until conditions are safe to resume normal function.

A simple power reset may temporarily clear the P515 code, but if the underlying cause such as a failed crankcase heater or refrigerant overcharge is not addressed, the error will return. If the code clears after the unit warms up and does not come back, refrigerant migration during a cold idle period was likely the cause. Recurring P515 errors after resets indicate a component fault that needs physical inspection.

Repair costs vary widely depending on the root cause. If the issue is simply refrigerant migration that clears after warm-up, there may be no part cost beyond a diagnostic service call, which typically runs in the range of $75 to $150. A replacement crankcase heater is a relatively affordable part, but labor adds to the total. If the root cause turns out to be compressor damage or a refrigerant system issue, costs can range from several hundred to over a thousand dollars depending on the extent of repairs needed.

Some cases of P515 resolve on their own after the unit has been powered on for a period of time, allowing the crankcase heater to boil off any refrigerant that has migrated into the sump. However, if the error persists, diagnosing the crankcase heater, temperature sensors, or refrigerant charge level requires technical knowledge and proper tools. Refrigerant handling in particular must be performed by a certified HVAC technician.

The P515 protection is designed to prevent the compressor from running under unsafe conditions, so the unit itself is limiting operation to reduce damage risk. You should not attempt to bypass or override this protection. Continuing to force the system to run while this code is active could result in compressor failure, which is one of the most costly repairs on an air conditioning system.