BoilerFaultCodesThe 6 most common faults
Your boiler has failed to light or cannot detect a flame, meaning your heating and hot water will not work.
Check if your gas supply is turned on and other gas appliances are workingPress and hold the Reset button for five secondsEnsure your condensate pipe has not frozen if the weather is extremely cold
Your boiler has shut down because it has detected it is getting too hot, likely due to a circulation issue or a sensor fault.
Ensure all radiator valves (TRVs) are fully open to allow water flowCheck that the boiler pressure is between 1.0 and 1.5 bar on the gaugePress the 'Reset' button on the front of the boiler control panel
Your boiler has stopped working because the water pressure is too low for the system to run safely.
Locate the filling loop (usually a silver flexible hose) underneath the boiler.Slowly open the valve(s) until you hear water flowing and watch the pressure gauge.Close the valve(s) tightly once the pressure gauge reaches between 1 and 1.5 bar.
Your boiler has stopped working because water is not moving around the heating system correctly.
Check that your boiler pressure is between 1.0 and 1.5 barEnsure all radiator valves and internal stop taps are fully openGently bleed your radiators to remove trapped air
Your boiler has shut down because it has detected that the exhaust gases are becoming too hot, which is a safety feature to prevent damage to the internal components.
Full guide for E03Your boiler has identified a problem with the ventilation system that clears away exhaust fumes, causing it to shut down for safety.
Full guide for E05on the Biasi Dina
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