BoilerFaultCodesThe 6 most common faults
Your boiler has tried to light several times but has failed, which means the system has locked itself out for safety.
Check if other gas appliances, like a hob, are working to ensure gas is reaching your home.Verify that your gas prepaid meter (if applicable) is in credit.Press and hold the 'R' Reset button for several seconds to try and restart the boiler.
Your boiler has become too hot and has shut itself down as a safety precaution to prevent damage.
Check that all radiator valves are fully open to allow water to circulate.Ensure there is enough pressure in the system by checking the gauge is between 1 and 1.5 bar.Wait for the boiler to cool down and try pressing the 'Reset' button.
Your boiler has been manually reset too many times in a short period and has now locked itself out as a safety precaution.
Turn off the electrical power supply to the boiler at the fused spur switch.Wait for approximately 30 seconds.Turn the power back on to clear the temporary lockout and allow the boiler to restart.
Your boiler has stopped working because the water pressure in the heating system has dropped too low.
Locate the filling loop (usually blue-handled levers or a pull-out tab) underneath the boilerSlowly open the valves until you hear water entering the systemWatch the pressure gauge and close the valves once the needle reaches between 1.0 and 1.5 bar
Your boiler’s control panel buttons have detected a fault or are stuck, preventing you from changing settings or resetting the unit.
Check if any control buttons are physically stuck or jammed in the pressed position.Gently wipe the control panel with a dry microfiber cloth to remove debris or moisture.Turn the power to the boiler off at the fused spur switch, wait 30 seconds, and turn it back on to reboot the panel.
Your boiler has lost its flame while running and has shut down as a safety precaution.
Check if other gas appliances (like a hob) are working to ensure gas is reaching the propertyCheck that your gas meter has credit if you have a prepayment meterPress and hold the reset button for several seconds to restart the boiler
on the Alpha E-Tec Plus 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