Carrier Error Codes
Every Carrier error code we have catalogued, with what it means on site — 37 codes in total. In R-Pro, tap any code to get the meaning, likely causes and inspection steps, even with no signal in the plant room.
37 codes
| Code | What it means |
|---|---|
| E0 | Indoor EEPROM parameter error |
| E1 | Indoor/outdoor communication error |
| E2 | Zero-crossing signal error |
| E3 | Indoor fan speed out of control |
| E4 | Indoor temp sensor T1 open/short |
| E5 | Evaporator coil sensor T2 open/short |
| E6 | Room or evaporator coil sensor open/short |
| E7 | Outdoor fan speed out of control |
| E8 | System overload protection |
| EC | Refrigerant leakage detection |
| EE | Memory card error |
| F0 | Pump down mode |
| F1 | Outdoor ambient sensor T4 open/short |
| F2 | Condenser coil sensor T3 open/short |
| F3 | Compressor discharge sensor T5 open/short |
| F4 | Outdoor EEPROM parameter error |
| F5 | Outdoor fan speed out of control |
| H1 | Defrost / heating oil return cycle |
| H3 | Compressor overheat protection |
| H5 | IPM protection |
| HC | PFC protection malfunction |
| LC | Compressor start-up failure |
| LD | Compressor phase loss protection |
| LE | Compressor stalling |
| LP | Indoor/outdoor units mismatch |
| P0 | IPM malfunction / IGBT overcurrent |
| P1 | Over/under voltage protection |
| P2 | Compressor top high temp protection |
| P4 | Inverter compressor drive error |
| P5 | Compressor current protection |
| P6 | Inverter drive ↔ main board comm error |
| P7 | Heat sink temp sensor malfunction |
| P8 | IPM over-temperature protection |
| PH | High voltage protection |
| PL | Low voltage protection |
| U1 | Compressor phase detection malfunction |
| U3 | Low DC bus voltage |
Official Carrier source / manual ↗
Look up any error code — offline — in R-Pro.
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