BoilerFaultCodesThe 6 most common faults
01
Faulty air pressure sensor High Engineer
Your boiler is struggling to detect the airflow needed for safe operation, so it has shut down to prevent any issues.
Full guide for Faulty air pressure sensor02
Safety thermostat lock out High Engineer
Your boiler has detected that it has become dangerously overheated and has automatically shut itself down to prevent damage or fire risk.
Full guide for Safety thermostat lock out03
Flame detection error High Engineer
Your boiler is failing to light the flame or keep it running, which means it cannot produce heating or hot water safely.
Full guide for Flame detection error04
Other faults High Engineer
Your boiler is experiencing a generic system error that prevents it from operating correctly and providing heat or hot water.
Full guide for Other faults05
Er01 High Engineer
Your boiler has failed to light the flame and has locked itself down for safety, meaning you currently have no heating or hot water.
Full guide for Er0106
Lack of burner ignition High Engineer
Your boiler is failing to light the flame needed to produce heat or hot water.
Full guide for Lack of burner ignitionon the Biasi Riva Plus HE
Air Pressure SwitchVenturiFan assemblySafety thermostatPumpDiverter valve
Based on parts cited in our fault code database. Your engineer will confirm what's actually needed after diagnosis.
Call a Gas Safe engineer if…
- You can smell gas or see signs of a leak
- The Biasi shows an Emergency or High severity code
- The boiler keeps locking out after repeated resets
- You've tried the DIY checks and the fault hasn't cleared
- There's visible water leaking from the boiler
- The flame is yellow or orange instead of blue