BoilerFaultCodesThe 6 most common faults
Your boiler has shut down because it is getting too hot too quickly, usually because the water inside isn't circulating properly.
Check that your pump is running and hasn't seizedEnsure all radiator valves are fully open to allow water to flowCheck that the boiler pressure is between 1.0 and 1.5 barBleed all radiators to remove trapped air pockets
Your boiler was working but the flame has unexpectedly gone out, causing the system to stop for safety.
Check if other gas appliances in your home, like a hob, are still working to ensure gas supply.Verify that your prepaid gas meter has credit if applicable.Restart the boiler by turning the selector switch to the reset position for five seconds.
Your boiler has detected that water is either not moving through the system correctly or a temperature sensor has failed, preventing it from heating up safely.
Check that your central heating valves (under the boiler) are fully openEnsure all radiator valves are turned on to allow water to flowReset the boiler by turning the selector switch to the 'R' position for five seconds
Your boiler has got too hot and has shut itself down as a safety precaution.
Check that your radiator valves are openEnsure your system water pressure is between 1 and 1.5 barTurn the selector switch to 'Reset' for five seconds and then back to 'On'
Your boiler is failing to light the gas or cannot stay lit, which means your heating and hot water have stopped working.
Check if other gas appliances, like a cooker, are working to confirm gas supply is activeCheck that your credit meter has not run out of fundsPress and hold the reset button for five seconds
Your boiler has shut down because a safety circuit or external control link has been disconnected or broken.
Full guide for 2 flashes greenon the Baxi EcoBlue Heat
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