Complete guide to Riva Plus, Advance Plus, Inovia series fault codes with troubleshooting advice
Biasi boilers use E-codes displayed on the digital panel. Here is the complete list:
| Code | Meaning | Quick Fix | DIY? |
|---|---|---|---|
| E01 | Ignition failure - no flame detected | Check gas supply, thaw frozen condensate pipe, reset | Partial |
| E02 | Overheat safety thermostat activated | Let boiler cool, check system circulation | Partial |
| E03 | Flue overheat protection | Let boiler cool, check flue is clear | No |
| E04 | Low water pressure | Top up pressure using filling loop to 1.0-1.5 bar | Yes |
| E05 | Flow temperature sensor fault | Reset boiler | No |
| E06 | DHW temperature sensor fault | Reset boiler | No |
| E07 | Return temperature sensor fault | Reset boiler | No |
| E08 | Outside temperature sensor fault | Reset boiler, check sensor wiring | No |
| E09 | Fan fault | Reset boiler | No |
| E10 | Air pressure switch fault | Reset boiler, check flue is clear | No |
| E11 | False flame detection | Do NOT repeatedly reset - call engineer | No |
| E12 | Flame lost during operation | Check gas supply, reset boiler | Partial |
| E13 | PCB communication fault | Reset boiler | No |
| E14 | High system pressure | Bleed a radiator to release pressure | Partial |
| E15 | Pump fault | Check pump operation, reset | No |
| E16 | Heat exchanger overheat | Check system circulation, let boiler cool | Partial |
| E17 | Water pressure sensor fault | Reset boiler | No |
| E18 | Filling operation timeout | Check filling loop, top up pressure | Partial |
| E19 | Flow rate too low | Check system for blockages | No |
| E20 | Gas valve fault | Reset boiler | No |
| E21 | Condensate pipe blocked | Thaw frozen condensate pipe | Partial |
| E22 | Diverter valve fault | Reset boiler | No |
| E23 | Ignition electrode fault | Reset boiler | No |
| E24 | Flame detection electrode fault | Reset boiler | No |
| E25 | Temperature difference too high | Check system circulation, bleed radiators | Partial |
| E26 | Burner modulation fault | Reset boiler | No |
| E27 | Parameter error | Reset boiler | No |
| E28 | Thermostat wiring fault | Check thermostat connections | No |
Our Gas Safe engineers service all Biasi models across Harrow and London.