BoilerFaultCodesThe 6 most common faults
Your boiler is failing to light the flame needed to heat your water and home.
Check if your gas supply is active by testing another gas appliance like a hob.Verify that your prepaid gas meter has sufficient credit.Press and hold the reset button for several seconds to try restarting the boiler.
Your boiler has detected that it is getting too hot and has automatically shut down to prevent any internal damage.
Check that your radiator valves are open to allow water to circulateCheck your system pressure gauge is between 1.0 and 1.5 barPress and hold the 'R' reset button for several seconds to restart the boiler
Your boiler is struggling because it cannot detect enough water flowing through its internal system, which prevents it from safely heating your home.
Check your boiler's pressure gauge on the front panel; it should be between 1.0 and 1.5 barIf the pressure is below 1.0 bar, locate the filling loop hose underneath the boilerOpen the valves on the filling loop to allow cold mains water in until the needle reaches 1.5 bar, then securely close the valves
Your boiler has blocked itself from being restarted because it has detected a recurring fault that you have tried to reset too many times.
Turn off the power supply to the boiler at the fused spur switchWait for 30 secondsTurn the power back on to clear the temporary lockout memory
Your boiler has stopped working because the water pressure inside your heating system has dropped too low to operate safely.
Locate the external filling loop, which is a silver braided flexible hose connected to two valves under the boiler.Open the valves slowly to allow mains cold water into the system until the pressure gauge on the front panel reads between 1.0 and 1.5 bar.Close both valves tightly to prevent over-pressurisation.
Your boiler has stopped heating because it is struggling to keep the flame lit, which means you currently have no heating or hot water.
Check if other gas appliances, like a hob, are working to ensure gas is reaching the property.Ensure your gas meter has credit if you use a pre-payment meter.Restart the boiler by pressing the reset button for a few seconds.
on the Alpha Intec 50CS
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