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 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 stopped working because the water pressure is too low for it to operate safely.
Locate the filling loop (usually two blue levers or a braided hose) underneath the boiler.Slowly open the valves until you hear water entering the system.Watch the pressure gauge until it reaches 1.5 bar, then close the valves tightly.Press the Reset button on the control panel to clear the fault.
Your boiler has shut down because it has detected it is getting too hot, which is usually caused by water not circulating properly through the system.
Check that your central heating valves and radiator valves are fully open.Bled your radiators to ensure there is no trapped air blocking the flow.Verify that the boiler pressure is between 1 and 1.5 bar on the pressure gauge.
Your boiler tried to light the burner but couldn't detect a flame, causing it to stop for safety.
Check if other gas appliances, like a cooker, are working to ensure gas supply is activeCheck that your credit meter has not run out of fundsPress 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