BoilerFaultCodesThe 6 most common faults
Your boiler is overheating because water is not moving through the system quickly enough to be cooled down.
Check that your radiator valves are turned on and not closed.Ensure your external heating pump is running if you have one.Try resetting the boiler by turning the selector switch to 'R' and then back to 'On'.
Your boiler has received an external signal to turn off, usually triggered by an connected thermostat, safety device, or a loose wiring connection.
Check if your room thermostat or programmer is turned on and set to a temperature higher than the current room temperature.Replace the batteries in your room thermostat if it uses them.Check your fuse box to ensure no heating-related switches have tripped.
Your boiler was working but the flame has unexpectedly gone out, causing the system to stop as a safety precaution.
Check if other gas appliances (like a hob) are working to ensure your gas supply is activeCheck that your gas meter has credit if you use a prepay meterPress and hold the reset button for five secondsCheck for any frozen external condensate pipes if it is currently freezing weather
Your boiler has detected a problem with how water is moving through the system or a fault with the sensors that monitor temperature.
Check that all radiator valves are openEnsure the external system pump is running (if accessible)Check that the boiler pressure is between 1 and 1.5 barReset the boiler by turning the selector switch to 'R' for five seconds
Your boiler has sensed it is getting too hot and has shut down as a safety precaution to prevent damage.
Check that all radiator valves are fully open to allow water to circulate.Ensure there is no air trapped in the system by bleeding your radiators.Press the reset button or turn the selector switch to 'R' for five seconds to see if the fault clears.
Your boiler is failing to light the gas or cannot stay lit, meaning you currently have no heating or hot water.
Check that your gas pre-payment meter (if you have one) has credit.Verify that other gas appliances in your home, like a hob, are working correctly.Reset the boiler by turning the selector switch to the 'R' position for five seconds and then back to its original setting.
on the Baxi EcoBlue Advance 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