BoilerFaultCodesThe 6 most common faults
Your boiler has overheated, causing a safety switch to trip and shut down the system to prevent damage.
Wait for the boiler to cool down for at least 20 minutesEnsure all radiator valves are fully openPress the 'Reset' button on the boiler control panel
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 braided hose underneath or near the boiler)Slowly open the small valves on the filling loop until you hear water flowingWatch the pressure gauge and close the valves once the needle reaches 1.5 bar
Your boiler has stopped working because water is not moving around the pipes properly, causing it to overheat and shut down for safety.
Check that the radiator valves and the main isolation valves under the boiler are fully open.Ensure the system pressure is between 1.0 and 1.5 bar on the pressure gauge.Gently bleed air from your radiators using a radiator key.Press the reset button once the boiler has cooled down.
Your boiler is failing to light the flame, which is often caused by a lack of gas reaching the unit or a temporary ignition glitch.
Check that your gas meter and emergency control valve are turned on.If you have a prepay meter, check that you have enough credit.Gently press and hold the 'Reset' button for 5 seconds.
Your boiler is struggling to move water around the system properly before it starts the heating process, often due to a blockage or a pump issue.
Check that all radiator valves and boiler isolation valves are fully openEnsure the system pressure is between 1.0 and 1.5 bar on the pressure gaugeGently bleed your radiators to remove any trapped air pockets
Your boiler has become too hot and has shut down as a safety measure to prevent damage.
Check if your radiator valves are openBleed your radiators using a radiator key to remove trapped airOnce the boiler has cooled, press the reset button
on the Baxi Suprima 70
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