BoilerFaultCodesThe 6 most common faults
Your boiler has likely overheated, causing a safety switch to kill the power to prevent any damage.
Check that your radiator valves are open and not stuckAllow the boiler to cool down for at least 30 minutesPress the 'Reset' button on the front of the boiler
Your boiler has lost water pressure, which means there isn't enough water inside the system for it to run safely.
Locate the filling loop (a flexible silver hose) underneath or near the boiler.Slowly open the one or two taps on the hose until you hear water entering the system.Watch the pressure gauge and close the taps when the needle reaches 1.5 bar, then press the reset button.
Your boiler is struggling to move heated water through the system, often caused by a blockage or a pump failure.
Check that all radiator valves are fully openEnsure your system water pressure is between 1.0 and 1.5 barBleed all radiators to remove trapped air that might be blocking flow
Your boiler is not receiving enough gas or is struggling to light the flame needed to generate heat.
Check if other gas appliances in your home, like a hob, are working correctly.Ensure your gas emergency control valve is in the 'on' position.If you have a pre-payment meter, check that you have sufficient credit.Press and hold the reset button for five seconds.
Your boiler has become too hot and has shut down as a safety precaution to prevent damage.
Wait for the boiler to cool down completelyBleed your radiators to remove trapped air that might be blocking water flowCheck that your system pressure is topped up and all radiator valves are openPress the reset button once the system has cooled
Your boiler has stopped working because there is not enough water pressure in the central heating system to operate safely.
Locate the external filling loop, which is usually a flexible silver hose with two small valves.Slowly open both valves one at a time until you hear water flowing into the system.Watch the pressure gauge and close both valves tightly once the needle reaches between 1.0 and 1.5 bar.
on the Baxi Suprima 115
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