BoilerFaultCodesThe 6 most common faults
Your boiler has safety-tripped because it has become too hot, often caused by a lack of water flow or a minor blockage.
Check that your system pressure is between 1.0 and 1.5 bar on the pressure gaugeEnsure all radiator valves and any isolation valves are fully openAllow the boiler to cool down and then 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 (usually a silver braided hose underneath the boiler).Slowly open the valve(s) until you hear water entering the system.Watch the pressure gauge and close the valves once it reaches between 1.0 and 1.5 bar.
Your boiler is struggling to move water through the system, which is causing it to stop running to prevent overheating.
Check that your system pressure is between 1.0 and 1.5 bar on the gaugeEnsure all radiator valves and the boiler's isolation valves are fully openGently bleed your radiators to remove any trapped air pockets
Your boiler has failed to light because it either cannot get enough gas or it cannot detect the flame it has sparked.
Check that your gas emergency control valve is in the open positionIf you have a prepay meter, check that you have enough credit and the meter is not lockedCheck if other gas appliances like your hob are working correctlyPress the reset button or turn the selector switch to 'R' for five seconds
Your boiler has become too hot and has switched itself off as a safety precaution, often because air is trapped in the system preventing water from flowing properly.
Switch off the boiler and allow the system to cool down completelyUse a radiator key to bleed any trapped air from all radiators, starting with the lowest floorCheck your boiler pressure gauge and top it up to 1.5 bar if it has droppedPress the reset button on the front of the boiler
Your boiler has stopped working because the water level inside the system is not high enough to operate safely.
Locate the filling loop (a flexible silver hose) under the boiler.Slowly open the valve(s) until you hear water entering.Watch the pressure gauge until it reaches between 1.0 and 1.5 bar, then close the valves tightly.
on the Baxi Profile
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