Samsung Air Conditioner Error Code E413

The E413 error code on a Samsung air conditioner indicates that the SUMP sensor has triggered a protective control operation. The SUMP sensor monitors the temperature at the compressor sump, which is the lower section of the compressor where refrigerant oil and refrigerant liquid can accumulate. When liquid refrigerant migrates into the compressor sump, it dilutes the lubricating oil and can cause serious mechanical damage during startup. The protective control function activates to prevent the compressor from operating under these dangerous conditions.

This error most commonly appears when the SUMP sensor detects conditions consistent with refrigerant flooding back into the compressor. Refrigerant inflow to the compressor can occur due to abnormal system pressures, low ambient temperature operation, refrigerant overcharge, or a malfunctioning expansion valve that allows excessive refrigerant to pass into the low-pressure side. When liquid refrigerant reaches the compressor, it cannot be compressed like a gas, and the resulting hydraulic lock or oil dilution can cause catastrophic compressor failure.

The first diagnostic step is to verify that the SUMP sensor is physically mounted in the correct position on the compressor and that its wiring connector is fully seated and undamaged. A sensor that has shifted out of position may report inaccurate temperature readings, triggering false protective shutdowns. After confirming proper sensor placement and connection integrity, further diagnosis should focus on the refrigerant circuit itself, including system pressures and expansion valve function, to determine if actual refrigerant inflow is occurring.