BoilerFaultCodesThe 6 most common faults
Your boiler has likely overheated or a sensor has failed, causing the system to shut down for safety.
Check that all radiator valves are open to ensure water can flow.Allow the boiler to cool down for at least 20 minutes.Press the reset button or turn the mains power off and back on.
Your boiler has become too hot and has automatically shut down to prevent damage or safety issues.
Check that all radiator valves are open to allow water to circulate.Ensure your system pressure is at the correct level (usually 1 to 1.5 bar).Once the boiler has cooled down, press the reset button on the front or underside of the unit.
Your boiler has tried to start up several times but cannot create a flame, meaning your heating and hot water will not work until it is reset or repaired.
Check if other gas appliances in your home, like a hob, are working to ensure gas is reaching the propertyCheck if your gas meter has creditTurn the selector switch to the reset position for five seconds, then turn it back to the 'on' position
Your boiler has stopped working because the fan that helps remove waste gases is not spinning correctly or has lost power.
Full guide for 4 red flashesYour boiler's computer memory has developed a internal communication error and can no longer read its own settings.
Full guide for 5 red flashesYour boiler has detected an internal communication or electrical problem that is preventing it from starting up safely.
Full guide for 6 red flasheson the Baxi Profile
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