BoilerFaultCodesThe 6 most common faults
Your boiler has detected that hot water isn't moving around your radiators or taps properly, so it has turned itself off to prevent overheating.
Check your boiler pressure gauge; if it is below 1 bar, use the filling loop to top it up to 1.5 bar.Ensure all radiator valves are fully open throughout your home.Check that your external central heating programmer or thermostat is set to 'On' and calling for heat.
Your boiler has stopped working because the water pressure inside your heating system has dropped too low.
Locate the filling loop, which is a silver braided hose with one or two valves underneath the boiler.Open the valves slowly to allow water into the system until the pressure gauge on the front of the boiler reads between 1.0 and 1.5 bar.Close the valves tightly and check the display to see if the error code has cleared.
Your boiler is failing to detect enough water movement inside the system, so it has shut itself down to prevent damage.
Check your boiler's internal pressure gauge located on the front panel.If the needle is below 1.0 bar, locate the filling loop (usually a silver braided hose under the boiler).Slowly open the valve to let water in until the pressure reaches 1.5 bar, then ensure the valve is tightly closed.
Your boiler has stopped working because the water pressure inside the system has dropped too low to operate safely.
Locate the filling loop, which is usually a flexible metal hose underneath the boiler.Open the valves on the filling loop to allow water into the system until the pressure gauge reads between 1 and 1.5 bar.Close both valves tightly to stop the flow and check that the error code has cleared.
Your boiler has stopped working because the water pressure inside the heating system has dropped too low to operate safely.
Locate the external filling loop, which is usually a braided metal hose under the boiler connected to two valves.Gradually open the valves to allow water into the system until the pressure gauge on the front of the boiler reads between 1.0 and 1.5 bar.Close both valves firmly once the correct pressure is reached and check the boiler display to see if the error has cleared.
Your boiler is struggling to accurately measure the temperature of the water used for your radiators, causing it to shut down for safety reasons.
Full guide for 28on the Ariston Genus 30 Plus
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