BoilerFaultCodesThe 6 most common faults
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.
Your boiler has sensed that water is not moving around the system correctly, causing it to overheat and shut down for safety.
Check that your central heating valves and radiator valves are openEnsure your system water pressure is between 1.0 and 1.5 barTry resetting the boiler to see if the fault clearsGently bleed your radiators to remove any trapped air pockets
Your boiler has tried to light several times but has been unable to successfully create a flame to start the heating process.
Check that your gas supply is turned on at the meterIf you have a prepaid gas meter, check that you have sufficient creditPress and hold the reset button for five seconds
Your boiler has no power, meaning the display is blank and the heating is not working at all.
Check that the boiler power switch or fused spur next to the boiler is turned on.Check your home's main consumer unit (fuse box) to see if a circuit breaker has tripped.Replace the 3-amp fuse in the boiler's power spur switch.
Your boiler has tried to light several times but failed, meaning it has now locked itself out for safety.
Check if your gas supply is active (for example, by testing a gas hob)Locate the reset button on the front control panelPress and hold the reset button for at least 5 seconds and release
Your boiler has detected that it is overheating or that water is not moving through the system correctly, causing it to shut down for safety.
Check that all radiator valves are open and not turned to offEnsure your system water pressure is topped up to roughly 1.5 barPress the reset button once to see if the fault clears
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