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.
Common Bosch codes
- 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)
| 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 ↗
Frequently asked
What does Bosch error code C3 mean?
Bosch error code C3 means: Coil sensor (T3) fault in cooling. In R-Pro you also get the likely causes and the inspection steps — offline.
What does Bosch error code E4 mean?
Bosch error code E4 means: Temperature sensor fault (T3/T4/T5/TF). In R-Pro you also get the likely causes and the inspection steps — offline.
What does Bosch error code E5 mean?
Bosch error code E5 means: High or low voltage protection. In R-Pro you also get the likely causes and the inspection steps — offline.
What does Bosch error code E6 mean?
Bosch error code E6 means: Outdoor fan motor fault. In R-Pro you also get the likely causes and the inspection steps — offline.
What does Bosch error code E7 mean?
Bosch error code E7 means: Compressor discharge sensor (T5) fault. In R-Pro you also get the likely causes and the inspection steps — offline.
What does Bosch error code E9 mean?
Bosch error code E9 means: EEPROM fault. In R-Pro you also get the likely causes and the inspection steps — offline.
What does Bosch error code H0 mean?
Bosch error code H0 means: Communication fault in main control chip. In R-Pro you also get the likely causes and the inspection steps — offline.
What does Bosch error code H5 mean?
Bosch error code H5 means: Five pressure faults in 100 minutes (hard lockout). In R-Pro you also get the likely causes and the inspection steps — offline.
Look up any error code — offline — in R-Pro.
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