Carrier air conditioner error codes
Displayed on the indoor unit or remote when a fault is detected. Always isolate power before inspecting a unit — repairs belong to a qualified technician.
| Code | Meaning | Applies to | |
|---|---|---|---|
| E1 | High pressure protection in the refrigeration circuit. | All models | Details |
| E2 | Evaporator coil temperature sensor fault. | All models | Details |
| E3 | Low pressure protection. | All models | Details |
| E4 | Compressor discharge temperature protection. | All models | Details |
| E5 | Overcurrent or overload protection. | All models | Details |
| E6 | Communication error between indoor and outdoor units. | All models | Details |
| EC | Refrigerant leak detection alarm. | All models | Details |
| F0 | Low refrigerant protection. | All models | Details |
| P0 | High voltage protection. | All models | Details |
| P1 | Low voltage protection. | All models | Details |
| P4 | Fan speed fault. | All models | Details |