BoilerFaultCodesThe 6 most common faults
Your boiler has failed to light because it cannot detect a flame, which means your heating and hot water have stopped working.
Check if other gas appliances in your home (like a hob) are working to ensure gas is reaching the propertyEnsure your gas pre-payment meter (if you have one) has sufficient creditPress and hold the 'R' reset button for a few seconds to see if the boiler restarts
Your boiler has detected that it is getting too hot and has automatically shut itself down to prevent any damage or safety issues.
Check that all radiator valves are fully open to allow water to circulateEnsure your system pressure is between 1.0 and 1.5 bar on the front gaugePress and hold the reset button for a few seconds to restart the boiler
Your boiler has stopped working because it has been manually reset too many times following previous errors, and it now requires a professional to unlock the system.
Turn the boiler off at the main electrical fused spur switch.Wait for 30 seconds.Turn the power back on to clear the temporary lockout memory.
Your boiler has stopped working because the water pressure inside the heating system has dropped too low to operate safely.
Locate the external filling loop, which is a flexible braided hose underneath your boiler connected to two valves.Open the valves slowly to allow cold mains water to enter the system until the pressure gauge on the front of the boiler reads between 1.0 and 1.5 bar.Close both valves tightly to prevent over-pressurisation.
Your boiler has detected that hot water is not flowing through your heating system as efficiently as it should, causing it to shut down to prevent overheating.
Check all buttons on the front panel to see if any are stuck in the pressed positionGently press and release each button several times to ensure they move freelySwitch the boiler off at the fused spur switch, wait 30 seconds, and turn it back on
Your boiler has stopped working because it cannot stay lit, meaning your heating and hot water have turned off as a safety precaution.
Check that your gas emergency control valve is openIf you have a prepayment meter, check that you have sufficient creditPress and hold the reset button for several seconds to restart the boiler
on the Alpha E-Tec Plus 28
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