| E1 | Indoor and outdoor unit communication error | Wiring fault, PCB issue, or voltage fluctuation | Professional inspection of communication wiring and boards |
| E2 | Indoor unit temperature sensor fault | Damaged or disconnected room temperature sensor | Sensor replacement by a certified Samsung technician |
| C4 | Pipe temperature sensor fault on indoor unit | Faulty or corroded pipe thermistor | Thermistor replacement and refrigerant circuit check |
| E4 | Drain pump operation fault | Blocked drain, failed pump motor, or float switch fault | Drain system inspection and pump or float switch service |
| E6 | Outdoor unit temperature sensor fault | Damaged outdoor ambient sensor | Outdoor sensor replacement and system test |
| F1 | Refrigerant leak detection alert | Low refrigerant pressure detected by pressure sensor | Leak detection, repair, and refrigerant recharge |
| P1 | High pressure protection fault on outdoor unit | Blocked condenser, refrigerant overcharge, or fan failure | Condenser inspection, pressure measurement, and system check |
| P2 | Low pressure protection fault | Refrigerant undercharge or expansion valve fault | Refrigerant level check and pressure restoration |
| P4 | Inverter PCB overtemperature protection | Inverter board heat sink blocked or fan reduced | PCB inspection, heat sink cleaning, and airflow check |