Ravenheat is an Italian boiler manufacturer whose products are popular in the UK social housing sector. Their CSI, CS, WH, and HE ranges are commonly found in flats and council properties. Ravenheat fault codes differ by model range — CSI models use simple numeric codes while CS/WH/HE models use E-prefixed codes.
Ravenheat Boiler Fault Codes
All Ravenheat Fault Codes 31
| Code | Fault | Severity | Type | View guide |
|---|---|---|---|---|
| 01 | Ignition Failure (CSI) On Ravenheat CSI boilers, code 01 indicates the boiler has failed to ignite — check… | Medium | DIY Check | View Guide |
| 04 | Overheat Thermostat Fault (CSI) On Ravenheat CSI boilers, code 04 indicates the overheat thermostat needs checking. | High | Engineer | View Guide |
| 28 | Low Water Pressure / Pump Fault (CSI) On Ravenheat CSI 120 boilers, code 28 indicates a failed low water pressure switch or… | Low | DIY Check | View Guide |
| E01 | Ignition Failure Failed to ignite. | High | Engineer | View Guide |
| E02 | Pump Circulation Problem On Ravenheat CS/WH/HE models, E02 indicates a problem with the pump circulation — the pump… | Medium | Engineer | View Guide |
| E03 | Flow Sensor Damaged The flow temperature sensor has failed or has a wiring fault. | Medium | Engineer | View Guide |
| E04 | DHW Sensor Damaged On CS/WH/HE models, E04 indicates the domestic hot water sensor has failed. | Medium | Engineer | View Guide |
| E05 | Fan Fault — No Signal The fan is not running or there is no fan speed signal. The fan may… | High | Engineer | View Guide |
| E06 | CH Sensor Overheating The central heating temperature sensor is detecting an overtemperature condition. | High | Engineer | View Guide |
| E07 | Overheat Protection Safety thermostat activated. | High | Engineer | View Guide |
| E08 | Low Water Pressure System water pressure is below the safe minimum on Ravenheat CS/WH/HE boilers. | Low | DIY Check | View Guide |
| E09 | Overheat Sensor Overheating The overheat thermostat sensor has detected a dangerous temperature. | High | Engineer | View Guide |
| E10 | High Water Pressure The system water pressure is too high on Ravenheat boilers. | Medium | Engineer | View Guide |
| E11 | PCB Fault Internal PCB error. | High | Engineer | View Guide |
| E12 | Return NTC Fault Return sensor faulty. | Medium | Engineer | View Guide |
| E13 | DHW NTC Fault Hot water sensor faulty. | Medium | Engineer | View Guide |
| E14 | Pump Fault Pump not running. | High | Engineer | View Guide |
| E15 | Fan Fault Fan not running correctly. | High | Engineer | View Guide |
| E16 | Air Pressure Switch APS fault. | High | Engineer | View Guide |
| E17 | Low Water Pressure Pressure too low. | Low | DIY Check | View Guide |
| E18 | Gas Valve Fault Gas valve not responding. | High | Engineer | View Guide |
| E19 | Condensate Blocked Condensate pipe blocked. | Medium | DIY Check | View Guide |
| E20 | Diverter Valve Fault Valve stuck. | Medium | Engineer | View Guide |
| E21 | Flame Lost Flame lost during operation. | High | Engineer | View Guide |
| E22 | Flue Sensor Overheating The flue gas sensor has detected an overtemperature condition in the flue. | High | Engineer | View Guide |
| E23 | Flue Sensor Damaged The flue temperature sensor has failed or has a wiring fault. | Medium | Engineer | View Guide |
| E24 | Combustion Fault Air/gas mixture outside limits. | High | Engineer | View Guide |
| E25 | Heat Exchanger Frozen The main heat exchanger has frozen. This typically occurs when the boiler is in an… | High | DIY Check | View Guide |
| E26 | Rapid Temperature Rise Flow temp rising too fast. | High | Engineer | View Guide |
| E27 | Pressure Sensor Fault Electronic sensor faulty. | Medium | Engineer | View Guide |
| E46 | Water Pressure Sensor Error The water pressure sensor circuit is either open or short-circuited. | Medium | Engineer | View Guide |