BoilerFaultCodesThe 6 most common faults
Your boiler has shut down because it has detected it is getting too hot, triggering a safety switch to prevent damage.
Check that all radiator valves are open and not turned to zeroEnsure your system water pressure is at the correct level (usually 1.0 to 1.5 bar)Wait for the boiler to cool down, then press and hold the 'Reset' button
Your boiler has stopped working because the water pressure is too low for the system to run safely.
Locate the filling loop, which is usually a flexible silver hose under the boiler.Slowly open the small valves to allow water into the system while watching the pressure gauge.Close the valves once the needle reaches between 1.0 and 1.5 bar, then press the reset button.
Your boiler is overheating because the water is not moving around the pipes properly.
Check that all radiator valves are fully openCheck that the boiler pressure is between 1 and 1.5 bar on the gaugeGently bleed your radiators to remove any trapped air
Your boiler has failed to light because it either cannot get any gas or the internal sensor cannot detect the flame.
Check if your gas meter has credit and the isolation valve is openCheck if other gas appliances like a hob are working correctlyPress and hold the reset button for five seconds
Your boiler is struggling to move water through the system properly before it begins the heating process.
Check that your system water pressure is between 1.0 and 1.5 bar on the pressure gaugeEnsure all radiator valves and isolation valves under the boiler are fully openTry resetting the boiler using the reset button to see if the error clears
Your boiler has become too hot and has shut itself down as a safety precaution to prevent damage.
Turn off the boiler and allow it to cool down for at least 30 minutes.Check all radiator valves are open and bleed any air from your radiators using a radiator key.Check that your system pressure is between 1 and 1.5 bar, then press the reset button on the boiler control panel.
on the Baxi Suprima 50
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