BoilerFaultCodesThe 6 most common faults
Your boiler has stopped working because the water pressure inside the system is too low to operate safely.
Locate the filling loop (usually a silver braided hose with one or two valves underneath the boiler).Open the valve(s) slowly to allow mains water into the system while watching the pressure gauge on the front of the boiler.Close the valve(s) tightly once the needle reaches the green zone, typically between 1.0 and 1.5 bar.
Your boiler has lost its flame while trying to run, which means it cannot heat your water or your radiators.
Check that your gas supply is turned on at the meterIf you have a prepay meter, check that you have enough creditPress the Reset button on the boiler displayEnsure your external condensate pipe hasn't frozen in very cold weather
Your boiler has lost its flame while running, meaning it is not getting enough gas or the spark is failing to keep the burner lit.
Check if your gas meter has credit (if on a prepayment meter)Check if other gas appliances, like a hob, are working to confirm gas supplyReset the boiler by turning the mode knob to 'RE' and then back to the desired settingEnsure the external condensate pipe has not frozen if it is winter
Your boiler has lost communication with its internal memory chip, meaning it cannot operate safely until the settings are restored or the component is replaced.
Full guide for L1Your boiler has detected that it is getting too hot or cannot move water through the system, so it has safely shut itself down to prevent damage.
Full guide for L2Your boiler is failing to stay lit, which means it has safely shut itself down because it cannot consistently produce or hold a flame.
Full guide for F2 or Fn or Lnon the Ideal Independent C24
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 Ideal 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