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 stopped working because the water pressure inside the heating system has dropped too low.
Locate the filling loop (a flexible metal hose) underneath the boiler.Open the valves on the filling loop to allow cold mains water into the system.Watch the pressure gauge on the front of the boiler and close the valves once the needle reaches between 1 and 1.5 bar.
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 tried to light three times but could not detect a flame.
Check if other gas appliances in your home (like a hob) are working to ensure your gas supply is on.If you have a prepaid meter, check that you have remaining credit.Press the 'Reset' button on the boiler control panel once to see if the system restarts.
Your boiler has stopped working because the water pressure is too low, meaning there isn't enough water inside the system to operate safely.
Locate the filling loop (usually a silver braided hose with small taps) underneath the boiler.Slowly open the taps until you hear the water flowing and watch the pressure gauge needle move.Close the taps firmly once the pressure gauge reaches between 1 and 1.5 bar.
Your boiler tried to light the burner but couldn't detect a flame, so it is currently not providing heating or hot water.
Check if other gas appliances, like a hob, are working to ensure gas supply is activeCheck for any credit on your prepaid gas meterTurn the boiler off and on again to trigger a reset
on the Ariston Genus 27
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