BoilerFaultCodesThe 6 most common faults
Your boiler has likely overheated, causing a safety sensor to automatically shut the system down to prevent damage.
Check that your radiator valves are turned on and not blockedAllow the boiler to cool down for at least 30 minutesLocate the reset button (usually behind the drop-down flap) and press it firmly
Your boiler has stopped working because the water pressure is too low for the system to run safely.
Locate the filling loop (usually a silver flexible hose) underneath or near the boiler.Slowly open the tap or taps on the filling loop to let water into the system.Watch the pressure gauge and close the taps once it reaches between 1 and 1.5 bar.
Your boiler is unable to move hot water around the system effectively, causing it to shut down to prevent overheating.
Check that your radiator valves are open and not turned off.Ensure your system water pressure is between 1 and 1.5 bar on the gauge.Try bleeding your radiators to remove any trapped air pockets.
Your boiler is failing to light because it either cannot get enough gas or the system is not detecting a flame.
Check that your gas meter has credit and that the gas supply valve is open.Try restarting other gas appliances like a hob to confirm gas is flowing to the house.Press the reset button on the boiler controls to attempt to clear the fault.
Your boiler is struggling to move water around the system properly before it begins the full heating process.
Check that the central heating valves under the boiler are fully openEnsure all radiator valves (TRVs) are turned to the highest settingCheck the system pressure gauge and top up to 1.5 bar if it is too low
Your boiler has become too hot and has shut itself down as a safety precaution to prevent damage.
Turn the boiler off and allow the system to cool down completelyCheck all radiator valves are open and bleed any trapped air from your radiatorsCheck that your system pressure is at the correct level (usually 1.0 to 1.5 bar)Locate the manual reset button on the boiler and press it to restart
on the Baxi Profile Prima
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