BoilerFaultCodesThe 3 most common faults
Your boiler has failed to ignite the gas burner and has shut down as a safety precaution.
Check that your gas supply is active (e.g., check other gas appliances or pre-payment meter credit)Locate the reset button (usually marked 'R') on the control panel and press itEnsure there are no external blockages to the flue pipe outside your home
Your boiler has sensed it is getting too hot and has shut down as a safety precaution to prevent damage.
Check that all radiator valves are fully open (TRVs turned to max).Ensure there is enough water pressure in the system (typically 1.0 to 1.5 bar).Press the 'Reset' button on the control panel to see if the fault clears.
Your boiler has detected that the water pressure is too low to operate safely and has shut itself down as a precaution.
Locate the internal or external filling loop (braided silver hose) under or near the boiler.Slowly open the valve or valves to allow water into the system until the pressure gauge reaches 1.5 bar.Close the valves tightly and check if the 'D' LED has turned off; you may need to press 'Reset'.
on the Ariston Genus 15 RFFI
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