Lessar Error Codes
Every Lessar error code we have catalogued, with what it means on site — 30 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.
30 codes
| Code | What it means |
|---|---|
| E0 | Flow sensor issue / short circuit |
| E1 | Wrong phase rotation / 3-phase sequence error |
| E2 | Indoor/outdoor communication line error |
| E3 | Direct water temp sensor issue |
| E4 | Shell-and-tube HX sensor fault |
| E5 | Condenser pipe A sensor malfunction |
| E6 | Condenser pipe B sensor malfunction |
| E7 | Outdoor temp sensor failure |
| E8 | Compressor discharge sensor issue |
| E9 | Duct temp sensor (system A) fault |
| EA | Master/slave comm failure |
| P0 | Compressor A temp/pressure out of range |
| P1 | Compressor A pressure below limit |
| P2 | Compressor B temp/pressure exceeds limit |
| P3 | Compressor B pressure dropping |
| P4 | System A overcurrent |
| P5 | System B overcurrent / voltage fluctuation |
| P6 | Condensation temp increased (A) |
| P7 | Condensation temp increased (B) |
| P8 | Compressor temp rising (overheat) |
| P9 | Anti-cold wind protection (heating) |
| Pb | Frost protection (auto-defrost) |
| EC | Refrigerant leak detection |
| EE | Water level alarm (cassette/ducted) |
| Ed | Outdoor fault protection lockout |
| F1 | Room temp sensor fault (indoor) |
| F2 | Evaporator sensor fault |
| F3 | Condenser sensor fault |
| F4 | Outdoor ambient sensor fault |
| F5 | Compressor discharge sensor (inverter) |
Official Lessar source / manual ↗
Look up any error code — offline — in R-Pro.
Open R-Pro →