BoilerFaultCodesThe 5 most common faults
Your boiler has failed to light or cannot detect that the flame is burning, so it has shut down as a safety precaution.
Check if other gas appliances in your home, like a hob, are working to ensure gas is being supplied.If you have a prepaid gas meter, check that it has sufficient credit.Press and hold the reset button for several seconds to try and restart the boiler.
Your boiler has become too hot and has automatically shut down as a safety precaution to prevent damage.
Turn the boiler off and allow it to cool down for at least 20 minutesCheck that all radiator valves and internal stopcocks are fully openTurn the selector switch to the reset position for five seconds, then back to the desired mode
Your boiler is failing to light because it cannot detect a flame or isn't receiving enough gas.
Check if other gas appliances, like a cooker hob, are working to confirm your gas supply is active.If you have a prepaid gas meter, ensure it has sufficient credit.Reset the boiler by following the instructions in your user manual.
Your boiler's hot water sensor has stopped working correctly, meaning the system can no longer tell how hot the water is.
Full guide for E2Your water heater has detected a fault with its internal brain, causing the system to lock out for safety.
Full guide for F7on the Main Multipoint FF 3
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 Main 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