Carrier Indoor Unit Error Code
| E0 | Indoor unit EEPROM parameter error |
| E1 | Indoor / outdoor units communication error |
| E3 | Indoor fan speed has been out of control |
| E4 | Indoor room temperature sensor T1 open circuit or shortcircuit |
| E5 | Evaporator coil temperature sensor T2 open circuit or short circuit |
| EC | Refrigerant Leakage Detection |
| F1 | Outdoor ambient temperature sensor T4 open circuit or short circuit |
| F2 | Condenser coil temperature sensor T3 open circuit or short circuit |
| F3 | Compressor discharge temperature sensor T5 open circuit or short circuit |
| F4 | Outdoor unit EEPROM parameter error |
| F5 | Outdoor fan speed has been out of control |
| P0 | IPM malfunction or IGBT over-strong current protection |
| P1 | Over voltage or over low voltage protection |
| P2 | High temperature protection of compressor top diagnosis and solution |
| P4 | Inverter compressor drive error |
| P5 | Mode conflict |
| P6 | Compressor voltage protectio |
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