BoilerFaultCodesThe 6 most common faults
Your boiler is unable to light the gas burner to provide heating or hot water and has shut down for safety.
Check if other gas appliances, like a cooker, are working to ensure gas is reaching the property.Ensure your gas meter has credit if you use a pre-payment meter.Press the 'Reset' button on the control panel to attempt a restart.
Your boiler has stopped working because the water pressure inside the system has dropped too low to operate safely.
Locate the flexible silver filling loop underneath or near your boiler.Slowly open the small tap(s) on the loop to allow water into the system.Watch the pressure gauge and close the taps firmly once it reaches 1.5 bar.
Your boiler has shut down because it has detected that the water inside the system has become dangerously hot.
Locate the reset button (usually marked 'R') on the control panel and press it.Ensure all radiator valves are fully open to allow water to flow freely.Check that your system pressure is between 1.0 and 1.5 bar on the gauge and top up if necessary.
Your boiler has stopped working because the water pressure inside your heating system has dropped too low to function safely.
Locate the filling loop (a silver braided hose) underneath the boiler.Open the valves at both ends of the loop to allow water into the system.Monitor the pressure gauge on the front panel and close the valves once it reaches between 1.0 and 1.5 bar.
Your boiler is failing to ignite because it cannot detect the spark required to start the flame safely.
Full guide for E61 567Your boiler is failing to detect the flame correctly, so it has safely shut itself down to prevent gas from building up.
Full guide for E61 569on the Ariston Excalibur
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 Ariston 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