BoilerFaultCodesThe 6 most common faults
Your boiler has detected a problem with how it disposes of waste gases or a blocked drainage pipe, causing the system to shut down for safety.
Check the white plastic condensate pipe outside for signs of freezing or blockages.Inspect the external flue terminal to ensure it is not obstructed by debris or garden growth.Reset the boiler by turning the selector switch to 'R' for five seconds.
Your boiler has likely overheated, causing a safety sensor to automatically shut the system down to prevent damage.
Check that your boiler pressure is between 1 and 1.5 barEnsure all radiator valves and the bypass valve are open to allow water flowTurn the selector knob to 'R' (Reset) for five seconds and then release
Your boiler has stopped working because the water pressure is too low and needs to be topped up.
Locate the filling loop (the flexible silver hose) underneath or near the boiler.Slowly open the tap handles on the filling loop until you hear water flowing.Watch the pressure gauge and close the taps once the needle reaches between 1 and 1.5 bar.Ensure the taps are fully closed and press the Reset button on the control panel.
Your boiler has detected that hot water isn't moving through the system properly, which is usually caused by a trapped air bubble or a pump that has stopped working.
Check that your radiator valves are fully openBleed your radiators to remove any trapped airCheck that your system pressure is between 1 and 1.5 barRestart the boiler using the reset button
Your boiler has failed to light because it either isn't receiving gas or is unable to detect a flame.
Check that your gas emergency control valve is in the 'on' position.If you have a pre-payment meter, ensure you have credit and the meter is active.Press the 'Reset' button on the boiler fascia for 5 seconds to attempt a restart.In freezing weather, check if your external condensate pipe has frozen and thaw it with warm water.
Your boiler has detected that water is not moving correctly around the system before it starts the heating process, often due to a blockage or trapped air.
Check that your central heating valves and radiator valves are fully openBleed your radiators to remove any trapped air pocketsEnsure the system pressure is between 1.0 and 1.5 bar on the pressure gauge
on the Baxi Titanium
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