BoilerFaultCodesThe 6 most common faults
Your boiler has switched itself off because it has reached an unsafe temperature and needs to cool down.
Check if any radiator valves or the main bypass valve are closed.Ensure all radiator thermostats are turned up to encourage water flow.Wait for the boiler to cool down and press 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 underneath the boiler.Slowly open the valves until you hear water moving and watch the pressure gauge.Close the valves tightly once the gauge reaches between 1.0 and 1.5 bar.
Your boiler is overheating because the water is not moving around the system properly.
Check that all radiator valves are fully openCheck if the system pressure is between 1.0 and 1.5 barGently bleed air from your radiators using a radiator key
Your boiler is struggling to light or stay lit because gas isn't reaching the burner or the flame isn't being detected.
Check that your gas emergency control valve is open and you have credit on your gas meter.Try resetting the boiler by pressing the reset button for five seconds.If it is freezing outside, check that the white plastic condensate pipe leading outdoors isn't frozen solid.
Your boiler is struggling to move water around the system properly before it starts the heating process.
Check that your home's central heating valves and radiator valves are fully openCheck the boiler pressure gauge and top it up to 1.5 bar if it is too lowGently bleed your radiators to remove any trapped air pocketsReset the boiler by pressing the reset button for five seconds
Your boiler has become too hot and has shut down as a safety precaution to prevent damage.
Turn off the boiler and allow it to cool down completely.Check and bleed all radiators using a radiator key to release trapped air.Ensure all radiator valves (TRVs) are fully open.Press the reset button on the boiler control panel once cooled.
on the Baxi Suprima 30
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