Comfort-Aire Error Codes
Every Comfort-Aire error code we have catalogued, with what it means on site — 50 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.
50 codes
| Code | What it means |
|---|---|
| E0 | Indoor EEPROM parameter error |
| E1 | Outdoor high-pressure protection |
| E2 | Anti-freeze protection |
| E3 | Outdoor low-pressure protection |
| E4 | High discharge temp protection |
| E5 | Whole unit overcurrent protection |
| E6 | Indoor/outdoor communication error |
| E7 | Mode conflict |
| E8 | System overload protection |
| E9 | Indoor water full error |
| EE | Memory chip malfunction |
| F0 | Refrigerant recovery / low refrigerant |
| F3 | Outdoor ambient temp sensor error |
| F4 | Outdoor mid-coil temp sensor error |
| F5 | Outdoor discharge temp sensor error |
| F7 | Oil return for cooling |
| H1 | Forced defrosting mode |
| H2 | Oil return for defrosting/heating |
| H3 | Compressor overheat/overload protection |
| H5 | IPM protection lockout |
| H6 | No feedback from indoor motor |
| H7 | Motor desynchronization |
| HC | PFC driver error |
| LC | Startup failure |
| LA | Outdoor DC fan motor error |
| LD | Phase loss driver error |
| LE | Compressor stalling |
| LF | Over-speed driver error |
| L3 | Outdoor fan 1 malfunction protection |
| LP | Outdoor/indoor unit mismatch |
| P0 | IPM reset driver error |
| P5 | Compressor current protection |
| P6 | Main controller to drive comm problem |
| P7 | Radiation temp sensor error |
| P8 | Radiator overheating protection |
| P9 | AC contactor protection |
| PA | AC current protection |
| PC | Current sensor problem |
| PD | Sensor connection protection |
| PE | Temperature drift protection |
| PF | Drive board ambient temp sensor error |
| PH | Over-voltage protection |
| PL | Low voltage protection |
| PP | AC input voltage anomaly |
| PU | Charging circuit error |
| B5 | Liquid valve temp sensor open/short |
| B7 | Gas valve temp sensor open/short |
| C5 | Jumper cap malfunction |
| U1 | Phase current detection circuit malfunction |
| U5 | Complete unit current detection malfunction |
Official Comfort-Aire source / manual ↗
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