Bosch Error Codes
Every Bosch error code we have catalogued, with what it means on site — 19 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.
19 codes
| Code | What it means |
|---|---|
| C3 | Coil sensor (T3) fault in cooling |
| E4 | Temperature sensor fault (T3/T4/T5/TF) |
| E5 | High or low voltage protection |
| E6 | Outdoor fan motor fault |
| E7 | Compressor discharge sensor (T5) fault |
| E9 | EEPROM fault |
| H0 | Communication fault in main control chip |
| H5 | Five pressure faults in 100 minutes (hard lockout) |
| H8 | Pressure transducer fault |
| P0 | Control board temperature protection |
| P1 | High pressure switch protection |
| P2 | Low pressure protection |
| P3 | Compressor overcurrent protection |
| P4 | High compressor discharge temperature protection |
| P5 | Condenser coil temperature protection in cooling |
| P8 | Outdoor fan motor hurricane protection |
| PH | Low discharge superheat protection |
| F1 | High pressure switch fault |
| AtL | Ambient temperature limited |
Official Bosch source / manual ↗
Look up any error code — offline — in R-Pro.
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