BoilerFaultCodesThe 6 most common faults
Your boiler has failed to light the flame, which means you currently have no heating or hot water.
Check if other gas appliances, like a cooker, are working to confirm your gas supply is on.If it is a freezing day, ensure your external condensate pipe is not frozen and blocked.Press the 'Reset' button on the boiler control panel to attempt a restart.
Your boiler has stopped working because the water pressure inside the system has dropped too low and needs topping up.
Locate the filling loop (usually a silver flexible hose) underneath the boiler.Slowly open the small valve handles until you hear water entering the system.Watch the pressure gauge and close both valves firmly once it reaches 1.5 bar.
Your boiler has switched itself off because the water inside is getting too hot too quickly, usually because the water isn't moving through the pipes properly or there is trapped air.
Check that your central heating valves and radiator valves are fully openBleed your radiators to remove any trapped air from the systemEnsure the system water pressure is between 1.0 and 1.5 bar on the gaugeReset the boiler by pressing the 'Reset' button
Your boiler thinks a flame is burning even though it is supposed to be turned off, which causes it to shut down for safety.
Full guide for A02Your boiler has switched itself off because it has detected that the water inside has become dangerously hot or a temperature sensor has failed.
Full guide for A03Your boiler is failing to keep the flame lit after it starts up, which is usually caused by an issue with the gas supply or a blocked internal part.
Full guide for A06on the Ferroli i25
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 Ferroli 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
Avoid the next call-out bill
Monthly cover means no unexpected bills when your boiler breaks down.
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