BoilerFaultCodesThe 6 most common faults
Your boiler has stopped working because the water pressure inside the heating system has dropped too low.
Locate the filling loop, which is usually a metal braided 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 until it reaches 1.5 bar, then securely close the valves.
Your boiler has detected that the water level inside the heating system is too low to operate safely.
Locate the filling loop, which is usually a silver braided hose under the boiler connected to two valves.Slowly open the valves to allow mains water into your heating system.Watch the pressure gauge on the front of the boiler until it reaches the green zone, typically between 1.0 and 1.5 bar.Close both valves tightly and restart the boiler.
Your boiler is unable to light the gas flame to provide heating or hot water, and has shut down as a safety precaution.
Check if other gas appliances in your home, like a hob, are working to ensure gas supply.Verify that your prepaid gas meter has credit, if applicable.Press the Reset button on the control panel to see if the boiler restarts.
Your boiler is failing to light the gas burner, meaning it cannot provide heating or hot water.
Check if other gas appliances, like a cooker, are working to ensure gas supply is active.Check that your prepaid gas meter has enough credit.Press the 'Reset' button on the front control panel to attempt a restart.
Your boiler has detected that water is not moving through the system properly, which is preventing it from heating up safely.
Check the pressure gauge on the front of the boiler; it should be between 1 and 1.5 bar.If the pressure is below 1 bar, use the filling loop underneath the boiler to top up the water levels.Ensure all radiator valves and internal isolation valves are fully open to allow water to flow.Reset the boiler once the correct pressure is reached.
Your boiler has got too hot and has shut itself down as a safety precaution to prevent damage.
Wait 30 minutes for the system to cool down completelyCheck that all radiator valves are fully open to allow water flowTurn the selector switch to the 'Reset' position and then back to 'On'
on the Ariston Euro Combi 30 MFFI
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