BoilerFaultCodesThe 6 most common faults
Your boiler has failed to light, which means your heating and hot water will not work until the system is reset or the fuel supply is restored.
Check if other gas appliances in your home, like a hob, are working to ensure gas is reaching the propertyEnsure your gas meter has credit if you are on a prepay systemPress and hold the 'R' (Reset) button for a few seconds to try and restart the boiler
Your boiler has shut itself down because it has detected that it is getting too hot or has experienced a problem controlling the burner flame.
Check that all radiator valves are fully open to allow water to circulatePress and hold the 'Reset' button for a few seconds to clear the faultCheck your system pressure gauge is between 1.0 and 1.5 bar
Your boiler has detected that the water pressure in the central heating system is too low to operate safely.
Locate the filling loop (braided silver hose) underneath or near the boilerSlowly open the tap or taps on the filling loop until you hear water movingWatch the pressure gauge and close the taps once the needle reaches between 1.0 and 1.5 bar
Your boiler is overheating because water is not moving through the system properly.
Check that all radiator valves are fully openCheck the boiler pressure is between 1 and 1.5 barReset the boiler using the selector switch
Your boiler has lost its flame while running or failed to stay lit, so it has shut down for safety.
Check if other gas appliances (like a hob) are working to confirm gas supplyEnsure your gas meter has credit if you use a pre-payment meterPress and hold the 'R' (Reset) button for a few seconds to restart the boiler
Your boiler is struggling to keep its flame lit and has tried to restart several times without success, causing it to lock out for safety.
Check that your gas emergency control valve is in the 'on' positionIf you have a pre-payment meter, ensure you have sufficient creditCheck if other gas appliances in your home, such as a hob, are working correctlyPress and hold the reset button for a few seconds to restart the boiler
on the Alpha Evoke 10 / 18
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 Alpha 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