Ravenheat Combi Boiler Error Codes But though your Ravenheat boiler has served you faithfully, it has recently locked out and it displays a code. You know this code means something, but you don’t know what. To help you diagnose the problem, we have taken time to list common Ravenheat boiler problems and matched them to their fault codes.
Ravenheat Boiler Error Code Solutions
| Fault Codes | System Behaviour |
| F73 | Heating circuit pressure sensor fault |
| F74 | Heating circuit pressure sensor fault |
| F76 | Thermal fuse fault |
| F77 | Fault in gas valve motor |
| F83 | No water in the installation – the temperature does not increase when the burner is lit |
| F84 | Permanent temperature difference between flow and return heating sensors |
| F85 | Flow and return heating sensors fault |
| F86 | Underfloor heating contact fault |
| ERR | User interface fault |
| 04 | Domestic hot water (DHW) sensor faulty |
Ravenheat CSI 120 Boiler Error Codes
| Fault Code | System Behaviour |
| 17 | Possible issue with fan voltage |
| 01 | Boiler failed to ignite – problem with gas valve operation, fan failing to start, ignition control board and cable |
| 28 | Failed low water – pressure switch or pump, possible issue with pump, incorrect system pressure, or the low water switch pressure needs replacing |
| 12 | Failed heating sensor – issue with heating sensor and could need replacing |
| 04 | Failed overheat – the overheat thermostat needs checking |
| 30 | Failed flue temperature – check the operating system |
| 31 | Failed flue temperature – the flue sensor needs checking or replacing |
| 02 | Failed temperature – try resetting the boiler |
Ravenheat CS 80/90, WH System, WH 80/90 Boiler Error Codes
| Fault Code | System Behaviour |
| E02 | Problem with the pump circulation |
| E03 | Flow sensor damaged |
| E04 | Domestic hot water (DHW) sensor damaged |
| E05 | Problem with fan – possibly no signal |
| E06 | Central heating (CH) sensor is overheating |
| E08 | Low water pressure |
| E09 | Overheat sensor overheating |
| E10 | High water pressure |
| E13 | Software error |
| E21 | Central heating (CH) return sensor overheating |
| E22 | Flue sensor overheating |
| E23 | Flue sensor damaged |
| E24 | Central heating return sensor error – possibly damaged |
| E25 | Main heat exchanger frozen |
| E29 | Domestic hot water (DHW) sensor overheating error |
| E31 | OpenTherm communication error |
| E41 | Different flow/return temperatures |
| E42 | Different temperature error |
| E43 | Different temperature error |
| E44 | Different temperature error |
| E46 | Water pressure sensor error – could be open or short |
Ravenheat HE 80/90 HE 25-30s, HE 80-98s, HE 8-98s or HE 25-30s Compact Error Codes
| Fault Code | System Behaviour |
| 02E | Problem with the pump circulation |
| 03E | Flow sensor damaged |
| 04E | Domestic hot water (DHW) sensor damaged |
| 05E | Problem with fan, possibly no signal |
| 06E | Central heating sensor is overheating |
| 08E | Low water pressure |
| 09E | Overheat sensor overheating |
| 10E | High water pressure error |
| 13E | Software error |
| 21E | Central heating return sensor overheating |
| 22E | Flue sensor overheating |
| 23E | Flue sensor damaged |
| 24E | Central heating return sensor error, possibly damaged |
| 25E | Main heat exchanger frozen |
| 29E | D.H/W sensor overheating error |
| 31E | OpenTherm (OT) communication error |
| 41E | Different temperature between flow and return |
| 42E | Different temperature error |
| 43E | Different temperature error |
| 44E | Different temperature error |
| 46E | Water pressure sensor error -could be open or short |