BoilerFaultCodesThe 6 most common faults
Your boiler has failed to light, which means you currently have no heating or hot water because the system cannot create a flame.
Check if your gas supply is turned on at the meterCheck if other gas appliances, like a hob, are working correctlyPress and hold the 'R' or reset button for 2-3 secondsCheck that the condensate pipe outside hasn't frozen in cold weather
Your boiler has stopped working because it has detected that it is overheating, often caused by a lack of water movement or air trapped inside the unit.
Check that the central heating valves under the boiler are fully openEnsure your radiator valves are turned on and not blockedTry bleeding your radiators to remove any trapped air from the systemCheck the boiler pressure gauge and top up to 1.5 bar if it is low
Your boiler is struggling to light or keep its flame lit because it isn't receiving enough gas to stay running safely.
Check that your gas emergency control valve (usually by the meter) is fully openIf you have a pre-payment meter, check that you have sufficient credit and that the meter hasn't locked outCheck if other gas appliances, such as a hob, are working correctly to rule out a wider gas supply issueReset the boiler by pressing the 'reset' button for 1 second
Your boiler has detected that the water pressure in the system is too low for it to operate safely.
Locate the filling loop (a flexible silver hose) underneath or near the boilerSlowly open the small valve or valves on the loop until you hear water flowingWatch the pressure gauge and close the valves once it reaches between 1.0 and 1.5 bar
Your boiler has stopped to prevent it from overheating because water isn't moving through the system properly or there is trapped air inside.
Check that your system pressure is between 1 and 1.5 bar on the pressure gaugeBleed your radiators to remove any trapped air pocketsEnsure all radiator valves and isolation valves under the boiler are fully open
Your boiler has become too hot and has shut itself down as a safety precaution to prevent damage.
Check that all radiator valves are fully openEnsure the system pressure is between 1 and 1.5 bar on the gaugePerform a reset by pressing the 'R' or 'Reset' button
on the Ferroli iBoiler 24
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