BoilerFaultCodesThe 6 most common faults
Your boiler has detected that there is not enough water pressure flowing through the system to heat your home safely.
Locate the external filling loop (a silver braided hose beneath the boiler).Slowly open the valves attached to the loop until you hear water entering the system.Watch the pressure gauge on the front of the boiler until it reaches 1.5 bar, then firmly close the valves.
Your boiler has detected that water is not flowing through the system correctly, so it has shut down to protect itself from overheating.
Check your pressure gauge located on the front of the boiler; if it is below 1 bar, you need to repressurise the system.Locate the filling loop (usually a silver braided hose under the boiler) and open the valves to let water in until the pressure reaches 1.5 bar.Close valves tightly and press the reset button on your boiler control panel.
Your boiler has stopped working because it cannot detect enough water pressure circulating inside the system.
Check your boiler's internal pressure gauge located on the front panel.If the needle is below 1 bar, locate the filling loop (usually a silver braided hose under the boiler).Open the filling loop valves slowly to let mains water in until the needle reaches 1.5 bar, then close the valves tightly.
Your boiler has stopped working because it couldn't light the burner to create heat, most likely due to an issue with its gas supply.
Check if other gas appliances, like a cooker, are working to confirm gas is reaching the property.Ensure your gas stopcock is fully open and your gas meter has credit if you use a prepay meter.Press the Reset button on the boiler control panel to see if it restarts.
Your boiler has detected that water is not circulating correctly through the main system, causing it to stop for safety.
Check that your system pressure is between 1.0 and 1.5 bar on the pressure gauge.Ensure all radiator valves and isolation valves under the boiler are fully open.Attempt to bleed any air from your radiators using a radiator key.
Your boiler is failing to light itself after several tries and has locked out for safety.
Check if your gas supply is turned on at the meterCheck if other gas appliances like a hob are workingPress the Reset button once to see if the boiler restarts
on the Ariston Genus Premium
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