BoilerFaultCodesThe 6 most common faults
Your boiler has tried to ignite but was unable to stay lit, meaning your heating and hot water will not work until it is reset or repaired.
Locate the selector switch on the front control panelTurn the switch to the 'R' (Reset) position and hold for 5 secondsReturn the switch to its original position and check if the red light goes out
Your boiler is failing to light the gas to create a flame, which means your heating and hot water will not work.
Check that your gas supply is turned on at the meterTurn the selector switch to the 'Reset' position and hold for 5 secondsWait for the boiler to attempt to restart; if the light continues to flash, call a Gas Safe engineer
Your boiler is trying to start but cannot light the gas flame, meaning you will not have any heating or hot water.
Check that your gas emergency control valve is in the 'on' positionIf you have a prepaid gas meter, check that you have sufficient creditCheck if other gas appliances in your home, like a hob, are working correctlyReset the boiler by turning the selector switch to the 'R' position for at least five seconds
Your boiler is not firing up because it isn't receiving the necessary signal or fuel to start the heating process.
Full guide for Burner on neon NOT illuminatedYour boiler has detected an internal error and has entered a lock-out state, meaning it has switched itself off to prevent damage.
Full guide for Reset neon illuminated (Red)Your boiler is failing to clear its system of air before starting, so it has safely shut down to prevent ignition.
Full guide for neon flashing (Section D)on the Baxi Combi 80e
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 Baxi 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