Friedrich Error Codes
Every Friedrich 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 |
|---|---|
| E1 | High pressure / poor heat exchange |
| E2 | Anti-freezing protection (indoor) |
| E4 | Compressor / exhaust protection |
| E5 | Unstable supply voltage / overcurrent |
| E6 | Communication malfunction |
| E8 | High temperature resistant protection |
| EE | EEPROM malfunction |
| EU | High temp of inverter module |
| F1 | Indoor ambient temp sensor fault |
| F2 | Indoor evaporator temp sensor fault |
| F3 | Outdoor ambient temp sensor fault |
| F4 | Outdoor condenser temp sensor fault |
| F5 | Outdoor discharge temp sensor fault |
| F6 | Frequency limit (overload) |
| F8 | Frequency decrease (overcurrent) |
| F9 | Frequency decrease (high air discharge) |
| FH | Frequency limit (anti-freezing) |
| H0 | High temperature frequency decrease |
| H1 | Defrosting mode |
| H3 | Compressor overload protection |
| H4 | System abnormal temperature range |
| H6 | Indoor fan motor (PG) stalled |
| HC | PFC protection |
| C5 | Jumper cap malfunction protection |
| LC | Failure start-up (compressor) |
| P5 | Phase current overcurrent protection |
| P7 | Module temp sensor circuit malfunction |
| P8 | IPM module high temp protection |
| PH | DC bus-bar voltage too high |
| PL | DC bus-bar voltage too low |
| PU | Capacitor charging malfunction |
| U1 | Phase current detection circuit fault |
| U3 | DC bus-bar voltage dropping malfunction |
| U5 | Complete unit current detection fault |
| U7 | Four-way reversing valve abnormal |
| U8 | Indoor fan zero-crossing detection circuit |
| U9 | Outdoor unit zero-crossing malfunction |
Official Friedrich source / manual ↗
Look up any error code — offline — in R-Pro.
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